FeatureManifest.yaml - mozsearch

FeatureManifest.yaml - mozsearch
firefox-main
toolkit
components
nimbus
FeatureManifest.yaml
(file symbol)
Enable keyboard shortcuts
Source code
File a bug in Firefox :: Nimbus Desktop Client
Revision control
Permalink
Remove the Permalink
Git log
Mercurial log
Raw
Blame
Copy as Markdown
Other Tools
HG Web
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
# yaml-language-server: $schema=schemas/ExperimentFeatureManifest.schema.json
# Features must be added here to be accessible through the NimbusFeature API.
"no-feature-firefox-desktop"
description
: A dummy feature for experiments that target no feature.
owner
: beth@mozilla.com
applications
- firefox-desktop
- firefox-desktop-background-task
hasExposure
: false
allowCoenrollment
: true
variables
: {}
testFeature
description
: Test only feature
owner
: beth@mozilla.com
applications
- firefox-desktop
- firefox-desktop-background-task
hasExposure
: false
isEarlyStartup
: true
variables
enabled
type
: boolean
description
: Whether or not this feature is enabled
testInt
type
: int
fallbackPref
: nimbus.testing.testInt
description
: Int pref used by platform API tests
testSetString
type
: string
setPref
branch
: user
pref
: nimbus.testing.testSetString
description
: A string pref set by Nimbus tests
nimbus-qa-1
description
: A feature for testing pref-setting on the default branch.
owner
: beth@mozilla.com
hasExposure
: false
variables
value
type
: string
setPref
branch
: default
pref
: nimbus.qa.pref-1
description
: The value to set for the pref.
nimbus-qa-2
description
: A feature for testing pref-setting on the user branch.
owner
: beth@mozilla.com
hasExposure
: false
variables
value
type
: string
setPref
branch
: user
pref
: nimbus.qa.pref-2
description
: The value to set for the pref.
# Note: this feature is not for general use. If you want to run an experiment
# that sets prefs, you *must* register your feature in this manifest and specify
# the prefs you will control.
prefFlips
description
: Flip arbitrary prefs. Controlled by release management.
owner
: beth@mozilla.com
hasExposure
: false
allowCoenrollment
: true
variables
prefs
type
: json
description
"The prefs to set."
schema
uri
: resource://nimbus/schemas/PrefFlipsFeature.schema.json
path
: toolkit/components/nimbus/schemas/PrefFlipsFeature.schema.json
# TODO(
bug 1972426
): Remove this feature.
nimbusStore
description
: Configuration for the Nimbus ExperimentStore.
owner
: beth@mozilla.com
hasExposure
: false
variables
dbEnabled
type
: boolean
description
: >
If enabled, the NimbusEnrollments database table will be used as the
primary enrollment store.
setPref
branch
: user
pref
: nimbus.profilesdatastoreservice.read.enabled
dbSyncEnabled
type
: boolean
description
: >
If enabled, the RemoteSettingsExperimentLoader will trigger
unenrollments for experiments that are unenrolled in other profiles.
setPref
branch
: user
pref
: nimbus.profilesdatastoreservice.sync.enabled
description
: Search service related features.
owner
: search-and-suggest-program@mozilla.com
hasExposure
: true
exposureDescription
: >
Exposure is recorded when the visual search context menu item is shown or
would have been shown.
variables
scotchBonnetEnableOverride
type
: boolean
setPref
branch
: default
pref
: browser.urlbar.scotchBonnet.enableOverride
description
: >-
Whether or not enabling scotch bonnet feature.
If this variable is true, the following features are available as default.
* Unified search button
* Secondary action buttons
* Search term persistence
* Intuitive search keywords
* HTTP swap
trendingRequireSearchMode
type
: boolean
setPref
branch
: default
pref
: browser.urlbar.trending.requireSearchMode
description
: Controls whether trending suggestions are only shown in search mode or not.
trendingMaxResultsNoSearchMode
type
: int
setPref
branch
: default
pref
: browser.urlbar.trending.maxResultsNoSearchMode
description
: The maximum number of trending results mode outside search mode.
targetExperiment
type
: string
description
: >-
Recorded in SERP telemetry, this is the slug of the experiment someone
is requesting enrollment and branch information for. (Note that the
featureId needs to be set to
"search"
.)
visualSearchEnabled
type
: boolean
setPref
branch
: default
pref
: browser.search.visualSearch.featureGate
description
: >-
Feature gate for visual search.
searchConfiguration
description
: >-
Search experimentation support for the engine configuration. Some of these
options may cause an additional reload to occur during the startup phase.
owner
: search-and-suggest-program@mozilla.com
hasExposure
: false
variables
experiment
type
: string
setPref
branch
: user
pref
: browser.search.experiment
description
: >-
Used to activate only matching configurations that contain the value in
`experiment`
extraParams
type
: json
description
: >-
This allows extra parameters to be set for search engines requests including,
where calls to the suggestions API, the search engine configuration defines
those parameters.
The use of this field should be coordinated with the Search team.
The
field value is an array of objects with key/value fields. For example:
"key"
"google_channel_row"
"value"
"foo"
This
is matched to a section in the search configuration:
"params"
: [
"name"
"channel"
"experimentConfig"
"google_channel_row"
],
In this case, the resulting URL for the appropriate search engine would have
`&channel=foo` added to the URL when doing searches.
If the key is not referenced in the search configuration, then no parameter
will be added. If the parameter is in the search configuration, but there
is no experiment, or the experiment does not set a value, then the
parameter will not be included in the search url.
Only the search team can update the configuration.
separatePrivateDefaultUIEnabled
type
: boolean
setPref
branch
: user
pref
: browser.search.separatePrivateDefault.ui.enabled
description
: Whether the UI for the separate private default feature is enabled.
separatePrivateDefaultUrlbarResultEnabled
type
: boolean
setPref
branch
: user
pref
: browser.search.separatePrivateDefault.urlbarResult.enabled
description
: Whether the urlbar result for the separate private default is shown.
urlbar
description
: The Address Bar
owner
: search-and-suggest-program@mozilla.com
hasExposure
: true
exposureDescription
: >-
The timing of the exposure event depends on the experiment, but generally
the event is recorded once per app session when the user first encounters
the UI of the experiment in which they
're enrolled.
variables
actionsOnboardingTimesToShow
type
: int
fallbackPref
: browser.urlbar.quickactions.timesToShowOnboardingLabel
description
: >-
The number of times a user should be shown the actions onboarding label.
addonsFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.addons.featureGate
description
: >-
Feature gate that controls whether all aspects of the addons suggestion
feature are exposed to the user.
addonsShowLessFrequentlyCap
type
: int
description
: >-
If defined and non-zero, this is the maximum number of times the user
will be able to click the
"Show less frequently"
command for addon
suggestions. If undefined or zero, the user will be able to click the
command without any limit.
allowSearchSuggestionsForSimpleOrigins
type
: boolean
fallbackPref
: browser.urlbar.allowSearchSuggestionsForSimpleOrigins
description
: >-
Whether remote search suggestions should be fetched for search strings
that look like possible simple origins like
"mozilla.org"
. Search
suggestions will remain prohibited for search strings that look like
more complex origins that include userinfo or ports or are IP addresses.
ampFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.amp.featureGate
description
: >-
Feature gate that controls whether all aspects of the AMP suggestions
feature are exposed to the user.
ampMatchingStrategy
type
: int
fallbackPref
: browser.urlbar.quicksuggest.ampMatchingStrategy
description
: >-
The matching strategy for AMP suggestions. Leave undefined or set to
zero to use the usual default exact-keyword strategy. Otherwise set to
an integer value defined on `AmpMatchingStrategy` in
`RustSuggest.sys.mjs` (corresponding to the `AmpMatchingStrategy` enum
in the Rust component coerced to a 1-based integer value).
autoFillAdaptiveHistoryEnabled
type
: boolean
fallbackPref
: browser.urlbar.autoFill.adaptiveHistory.enabled
description
: Whether enabling adaptive history autofill.
autoFillAdaptiveHistoryMinCharsThreshold
type
: int
fallbackPref
: browser.urlbar.autoFill.adaptiveHistory.minCharsThreshold
description
: Minimum char length of the user
's search string to trigger adaptive history autofill.
autoFillAdaptiveHistoryUseCountThreshold
type
: string
description
: This value assumes float expression like
"0.47"
. Threshold for use count of input history that we handle as adaptive history autofill. If the use count is this value or more, it will be a candidate.
autoFillBackspaceBlockDurationMs
type
: int
setPref
pref
: browser.urlbar.autoFill.backspaceBlockDurationMs
branch
: user
description
: Duration in ms to temporarily block autofill after backspace penalty.
autoFillBackspaceThreshold
type
: int
setPref
pref
: browser.urlbar.autoFill.backspaceThreshold
branch
: user
description
: >-
How many times the user must consecutively backspace away an autofill
suggestion before we penalize and temporarily suppress it from
autofilling. The result may still appear as a regular history result.
autoFillDismissalBlockDurationMs
type
: int
setPref
pref
: browser.urlbar.autoFill.dismissalBlockDurationMs
branch
: user
description
: Duration in ms to block an origin or URL after user dismissal.
deduplicationEnabled
type
: boolean
setPref
pref
: browser.urlbar.deduplication.enabled
branch
: user
description
: >-
Feature gate that controls whether result deduplication in the urlbar
is enabled.
# TODO
Bug 1982966
: Remove this after all experiments and rollouts using it
# finish.
fakespotFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.fakespot.featureGate
description
: >-
Feature gate that controls whether all aspects of the Fakespot suggestion
feature are exposed to the user.
flightStatusFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.flightStatus.featureGate
description
: >-
Feature gate that controls whether all aspects of flight status suggestions
feature are exposed to the user.
importantDatesFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.importantDates.featureGate
description
: >-
Feature gate that controls whether all aspects of the important dates
suggestion feature are exposed to the user.
keywordExposureResults
type
: string
setPref
pref
: browser.urlbar.keywordExposureResults
branch
: user
description
: >-
Comma-separated list of result types that should trigger
keyword-exposure telemetry. Keyword exposures can be recorded along with
result exposures. To enable keyword exposures for a result type, you
must add it both to this variable and to `exposureResults`. The only
exception is the
"rust_exposure"
result type, which can be added to this
variable even if it
's not in `exposureResults` since it'
s enabled by
setting the `quickSuggestExposureSuggestionTypes` variable. Keyword
exposures are recorded in the `urlbar-keyword-exposure` ping. See that
ping
's description for more.
marketFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.market.featureGate
description
: >-
Feature gate that controls whether all aspects of the stock market
suggestions feature are exposed to the user.
mdnFeatureGate
type
: boolean
setPref
branch
: default
pref
: browser.urlbar.mdn.featureGate
description
: >-
Feature gate that controls whether all aspects of the mdn suggestion
feature are exposed to the user.
merinoClientVariants
type
: string
fallbackPref
: browser.urlbar.merino.clientVariants
description
: >-
Comma separated list of client variants to report to the Merino server.
May impact server behavior.
merinoEndpointURL
type
: string
fallbackPref
: browser.urlbar.merino.endpointURL
description
: >-
The Merino endpoint URL, not including parameters. An empty string will
cause Firefox not to fetch from Merino.
merinoOhttpConfigURL
type
: string
fallbackPref
: browser.urlbar.merino.ohttpConfigURL
description
: >-
OHTTP config URL for Merino requests.
merinoOhttpRelayURL
type
: string
fallbackPref
: browser.urlbar.merino.ohttpRelayURL
description
: >-
OHTTP relay URL for Merino requests.
merinoProviders
type
: string
fallbackPref
: browser.urlbar.merino.providers
description
: >-
Comma-separated list of providers to request from the Merino server.
Merino will return suggestions only for these providers.
merinoTimeoutMs
type
: int
fallbackPref
: browser.urlbar.merino.timeoutMs
description
: Timeout for Merino fetches (ms)
exposureResults
type
: string
setPref
pref
: browser.urlbar.exposureResults
branch
: user
description
: >-
Comma-separated list of result types that should trigger exposure
telemetry, which is recorded in the `exposure` event. By default
exposure results are visible like usual, but they can be hidden by
setting the `showExposureResults` variable to false. To also record
keyword exposures for a result type, include it in the
`keywordExposureResults` variable as well.
showExposureResults
type
: boolean
setPref
pref
: browser.urlbar.showExposureResults
branch
: user
description
: >-
Boolean used to determine if the results defined in `exposureResults` should be shown in search results. Should be false for Control branch of an experiment.
quickSuggestAmpTopPickCharThreshold
type
: int
fallbackPref
: browser.urlbar.quicksuggest.ampTopPickCharThreshold
description
: >-
Character-count threshold (inclusive) for showing AMP suggestions as top
picks. If an AMP suggestion is triggered by a keyword at least this many
characters long, it will be shown as a top pick. When this variable is
set, full keywords will also show AMP suggestions as top picks even if
they have fewer characters than this threshold.
quickSuggestAmpTopPickUseNovaIconSize
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.ampTopPickUseNovaIconSize
description
: >-
Whether or not use the Nova icon size for AMP suggestion.
Otherwise, use standard rich-suggestion size.
quickSuggestContextualOptInEnabled
type
: boolean
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn
description
: Whether the Firefox Suggest contextual opt-in result is enabled.
quickSuggestContextualOptInFirstReshowAfterPeriodDays
type
: int
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn.firstReshowAfterPeriodDays
description
: Period until reshow the Firefox Suggest contextual opt-in result when first dismissed.
quickSuggestContextualOptInSecondReshowAfterPeriodDays
type
: int
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn.secondReshowAfterPeriodDays
description
: Period until reshow the Firefox Suggest contextual opt-in result when second dismissed.
quickSuggestContextualOptInThirdReshowAfterPeriodDays
type
: int
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn.thirdReshowAfterPeriodDays
description
: Period until reshow the Firefox Suggest contextual opt-in result when third dismissed.
quickSuggestContextualOptInImpressionLimit
type
: int
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn.impressionLimit
description
: Limit for impression to dismiss the Firefox Suggest contextual opt-in result.
quickSuggestContextualOptInImpressionDaysLimit
type
: int
setPref
branch
: default
pref
: browser.urlbar.quicksuggest.contextualOptIn.impressionDaysLimit
description
: Days until dismiss the Firefox Suggest contextual opt-in result after first impression.
quickSuggestDynamicSuggestionTypes
type
: string
setPref
pref
: browser.urlbar.quicksuggest.dynamicSuggestionTypes
branch
: user
description
: >-
Comma-separated list of Suggest dynamic suggestion types to enable. Set
this variable to the `suggestion_type` defined in the remote settings
record that contains your suggestions. If you want to enable multiple
suggestion types, separate them with commas. One particular intended use
of this variable is to deliver hidden-exposure suggestions for testing
potential exposures. Hidden-exposure suggestions trigger exposure
telemetry based on a set of keywords you provide but they are never
visible. If you are testing multiple types of hidden-exposure
suggestions, consider using one experiment branch per type, especially
if you are also enabling keyword exposures. Exposure suggestions are
recorded in telemetry with the
"rust_exposure"
result type. It
's not
necessary to include
"rust_exposure"
in `exposureResults`. Unless you
are testing other results in the same experiment branch, it
's also not
necessary
to set `showExposureResults: false`. To also record keyword
exposures, include
"rust_exposure"
in `keywordExposureResults`.
quickSuggestEnabled
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.enabled
description
: >-
Gate for the Firefox Suggest feature as a whole. If false, the Firefox
Suggest preferences UI and Suggest suggestions will not be shown. If
true, the preferences UI will be shown, and the user can turn
suggestions on or off.
quickSuggestImpressionCapsSponsoredEnabled
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.impressionCaps.sponsoredEnabled
description
: Whether sponsored suggestions are subject to impression frequency caps. If false, sponsored suggestions can be shown an unlimited number of times over any given period. If true, sponsored suggestion impressions will be subject to the caps in the remote settings configuration.
quickSuggestImpressionCapsNonSponsoredEnabled
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.impressionCaps.nonSponsoredEnabled
description
: Whether non-sponsored suggestions are subject to impression frequency caps. If false, non-sponsored suggestions can be shown an unlimited number of times over any given period. If true, non-sponsored suggestion impressions will be subject to the caps in the remote settings configuration.
quickSuggestMlInitDelaySeconds
type
: int
fallbackPref
: browser.urlbar.quicksuggest.mlInitDelaySeconds
description
: >-
How long to wait in seconds after startup before initializing the
Suggest ML backend.
quickSuggestMlEnabled
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.mlEnabled
description
: >-
Whether Suggest will use the ML backend in addition to Rust.
quickSuggestNonSponsoredEnabled
type
: boolean
description
: >-
Deprecated
: In 146 and later this variable no longer does anything. It
should be removed once all current experiments that use it finish.
quickSuggestNonSponsoredIndex
type
: int
fallbackPref
: browser.urlbar.quicksuggest.nonSponsoredIndex
description
: >-
The index of non-sponsored QuickSuggest results within the general
group. A negative index is relative to the end of the group
quickSuggestOnlineAvailable
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.online.available
description
: >-
Whether online Suggest should be made available to the user.
quickSuggestRankingMode
type
: string
fallbackPref
: browser.urlbar.quicksuggest.rankingMode
description
: >-
Specify the ranking mode for QuickSuggest.
"default"
: ranking by static scores specified by individual providers.
"interest"
: ranking by relevance scores provided by `ContentRelevancyManager`.
"random"
: ranking by randomly selecting a winner out of candidates.
Note that this ranking mode can still be overridden by `quickSuggestScoreMap`.
If the ranking mode is unspecified or set to any unknown values, it will default
to the static score based ranking.
enum
- default
- interest
- random
quickSuggestScoreMap
type
: json
description
: >-
A JSON object that maps telemetry result types to suggestion scores. If
a telemetry result type is present in this map, the client will use the
corresponding score as the score for all suggestions of the type,
overriding all other sources of scores for the type. In other words,
the scores in this map will override scores that are set in remote
settings and Merino as well as scores that are hardcoded in the client.
Example
entries: `
"amo"
: 0.5`, `
"adm_sponsored"
: 0.9`
quickSuggestSettingsUi
type
: int
fallbackPref
: browser.urlbar.quicksuggest.settingsUi
description
: >-
When Suggest is enabled, this determines the Suggest settings that will
be visible in the settings UI (about:preferences). When Suggest is
disabled, this is ignored and Suggest settings are hidden. Possible
values
: (default) Full, all settings will be shown.
: None, no settings will be shown.
: Offline only, settings that pertain to online will be hidden.
quickSuggestSponsoredEnabled
type
: boolean
description
: Whether sponsored suggestions should be enabled by default. If this variable is specified, it will override the value implied by the scenario. It will never override the user
's local preference to disable (or enable) sponsored suggestions, if the user has already toggled that preference.
quickSuggestSponsoredIndex
type
: int
fallbackPref
: browser.urlbar.quicksuggest.sponsoredIndex
description
: >-
The index of sponsored Firefox Suggest results within the Firefox Suggest
section when
"Show search suggestions ahead of browsing history in
address bar results
" is checked. When not checked, the index is hardcoded
as -1. Negative indexes are relative to the end of the section.
quickSuggestSponsoredPriority
type
: boolean
fallbackPref
: browser.urlbar.quicksuggest.sponsoredPriority
description
: >-
Whether or not showing sponsored suggestion as priority.
If this variable is true, the following things are processed.
"Sponsored"
label is shown as the group label.
* Change the suggested index to 1.
* Handle as top pick.
realtimeMinKeywordLength
type
: int
description
: >-
The minimum prefix length of a realtime keyword the user must type to
trigger the suggestion.
realtimeShowLessFrequentlyCap
type
: int
description
: >-
If defined and non-zero, this is the maximum number of times the user
will be able to click the
"Show less frequently"
command for realtime
suggestions. If undefined or zero, the user will be able to click the
command without any limit.
recentSearchesFeatureGate
type
: boolean
setPref
branch
: default
pref
: browser.urlbar.recentsearches.featureGate
description
: Gate for the recent searches feature.
recentSearchesMaxResults
type
: int
setPref
branch
: default
pref
: browser.urlbar.recentsearches.maxResults
description
: The maximum number of recent searches to show.
resultExplanationsFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.resultExplanations.featureGate
description
: >-
When selecting and hovering over certain types of urlbar results,
replace their URLs with strings that explain why they
're shown.
semanticHistoryEnable
type
: boolean
setPref
branch
: user
pref
: places.semanticHistory.featureGate
description
: use semanticHistory Search feature.
semanticHistoryCompletionThreshold
type
: string
setPref
branch
: user
pref
: places.semanticHistory.completionThreshold
description
: >-
Fraction (0.0 – 1.0) of top Places rows that must have embeddings
before semantic-history search is enabled. 0.5 = 50 %.
semanticHistoryDefaultBatchChunksize
type
: int
setPref
branch
: user
pref
: places.semanticHistory.defaultBatchChunksize
description
: >-
The batch chunk size for updates for vectorDB
defaulted at 25.
semanticHistoryDistanceThreshold
type
: string
setPref
branch
: user
pref
: places.semanticHistory.distanceThreshold
description
: >-
semantic similarity distance threshold (0.0 - 1.0)
defaulted at 0.6.
semanticHistorySupportedRegions
type
: string
setPref
branch
: user
pref
: places.semanticHistory.supportedRegions
description
: >-
map-like JSON of regions and locales for which the feature is supported.
When `semanticHistoryEnable` is false, this list is ignored and the
feature is disabled everywhere. When true, the feature is enabled only
in the regions/locales listed here.
The
format is like:
'[["AU",["en-*"]],["CA",["en-*"]], …]'
where `-*`
can be used as a wildcard to match any locale that starts with the given
prefix.
showDebuggingIcons
type
: boolean
setPref
branch
: user
pref
: browser.urlbar.showDebuggingIcons
description
: >-
Whether or not to show debugging badges on urlbar results favicons.
sportsFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.sports.featureGate
description
: >-
Feature gate that controls whether all aspects of the sports suggestions
feature are exposed to the user.
suggestSemanticHistoryMinLength
type
: int
setPref
branch
: user
pref
: browser.urlbar.suggest.semanticHistory.minLength
description
: >-
Minimum length of search query when history semantic
search will be enabled.
suggestCalculator
type
: boolean
setPref
branch
: user
pref
: browser.urlbar.suggest.calculator
description
: >-
Whether or not to show calculator results when a user types a valid
calculation string into the urlbar.
unitConversionEnabled
type
: boolean
setPref
branch
: user
pref
: browser.urlbar.unitConversion.enabled
description
: >-
Whether or not to show unit conversion results when a user types a
valid unit conversion string into the urlbar.
weatherFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.weather.featureGate
description
: >-
Feature gate that controls whether all aspects of the weather suggestion
feature are exposed to the user.
weatherKeywordsMinimumLength
type
: int
description
: >-
If defined and non-zero, the weather suggestion will be triggered by
typing any prefix of a full weather keyword when the prefix is at least
`weatherKeywordsMinimumLength` characters long. If this variable is
absent or zero, Firefox will fall back to the minimum length defined in
remote settings. If neither Nimbus nor remote settings defines a minimum
length, only full keywords will trigger the suggestion.
weatherShowLessFrequentlyCap
type
: int
description
: >-
If defined and non-zero, this is the maximum number of times the user
will be able to click the
"Show less frequently"
command for weather
suggestions. If undefined or zero, the user will be able to click the
command without any limit.
weatherUiTreatment
type
: int
fallbackPref
: browser.urlbar.weather.uiTreatment
description
: >-
The
UI treatment to use for weather suggestions. Possible values:
: (default) Simplest UI with current temperature and location
: Simpler UI, adds current conditions, high/low, and URL
: Full UI, adds forecast
wikipediaFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.wikipedia.featureGate
description
: >-
Feature gate that controls whether all aspects of the Wikipedia
suggestions feature (part of Firefox Suggest) are exposed to the user.
yelpMinKeywordLength
type
: int
description
: >-
The minimum prefix length of a Yelp keyword the user must type to
trigger the suggestion.
yelpMlEnabled
type
: boolean
fallbackPref
: browser.urlbar.yelp.mlEnabled
description
: >-
Whether Yelp suggestions will be served from the Suggest ML backend
instead of Rust.
yelpFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.yelp.featureGate
description
: >-
Feature gate that controls whether all aspects of the Yelp suggestion
feature are exposed to the user.
yelpServiceResultDistinction
type
: boolean
fallbackPref
: browser.urlbar.yelp.serviceResultDistinction
description
: >-
Whether to distinguish service type subjects. If true, we show special
titile for the suggestion.
yelpShowLessFrequentlyCap
type
: int
fallbackPref
: browser.urlbar.yelp.showLessFrequentlyCap
description
: >-
If defined and non-zero, this is the maximum number of times the user
will be able to click the
"Show less frequently"
command for Yelp
suggestions. If undefined or zero, the user will be able to click the
command without any limit.
yelpSuggestNonPriorityIndex
type
: int
description
: >-
The group-relative suggestedIndex of Yelp suggestions within the Firefox
Suggest section. Ignored when `yelpSuggestPriority` is true.
yelpSuggestPriority
type
: boolean
fallbackPref
: browser.urlbar.yelp.priority
description
: >-
Whether or not showing yelp suggestion as priority.
If this variable is true, the following things are processed.
* Change the suggested index to 1.
* Handle as top pick.
yelpRealtimeFeatureGate
type
: boolean
fallbackPref
: browser.urlbar.yelpRealtime.featureGate
description
: >-
Feature gate that controls whether all aspects of Yelp realtime suggestions
feature are exposed to the user.
originsAlternativeEnable
description
: >-
Use an alternative ranking algorithm for autofilling origins, that is
mainly domains of Web pages. When the user types the beginning of an
origin, we autofill the whole origin. Whether autofill happens depends
on the ranking algorithm. Bookmarks are always autofilled anyway.
type
: boolean
setPref
branch
: user
pref
"places.frecency.origins.alternative.featureGate"
originsDaysCutOff
description
: >-
The alternative ranking algorithm only considers pages visited in the
last N days, where N is controlled by this variable.
type
: int
setPref
branch
: user
pref
"places.frecency.origins.alternative.daysCutOff"
pagesAlternativeEnable
description
: >-
Use an alternative ranking algorithm for sorting history and bookmarks
among the urlbar results.
type
: boolean
setPref
branch
: user
pref
"places.frecency.pages.alternative.featureGate"
pagesNumSampledVisits
description
: >-
The number of recent visits to sample when calculating the ranking of
a page. Examining all the visits would be expensive, so we only sample
recent visits.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.numSampledVisits"
pagesHalfLifeDays
description
: >-
The number of days after which the ranking halves. This implements the
"recency"
part of the algorithm.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.halfLifeDays"
pagesMaxVisitGap
description
: >-
The maximum allowed time (in seconds) between when a visit was recorded
and when an interaction occurs for them to be paired. This accounts
for slight discrepancies in their timestamps.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.interactions.maxVisitGapSeconds"
pagesViewTimeSeconds
description
: >-
The minimum allowed time (in seconds) a page was viewed before upgrading
the score of a visit.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.interactions.viewTimeSeconds"
pageViewTimeIfManyKeypressesSeconds
description
: >-
The minimum allowed time (in seconds) a page was viewed before checking
the manyKeypresses threshold.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.interactions.viewTimeIfManyKeypressesSeconds"
manyKeypresses
description
: >-
The minimum number of keypresses typed before upgrading the score
of a visit.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.interactions.manyKeypresses"
pagesVeryHighWeight
description
: >-
The weight to use for the very high importance bucket.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.veryHighWeight"
pagesHighWeight
description
: >-
The weight to use for the high importance bucket.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.highWeight"
pagesMediumWeight
description
: >-
The weight to use for the medium importance bucket.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.mediumWeight"
pagesLowWeight
description
: >-
The weight to use for the low importance bucket.
type
: int
setPref
branch
: user
pref
"places.frecency.pages.alternative.lowWeight"
aboutwelcome
description
"The about:welcome page"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent once per browsing session when the about:welcome URL is
first accessed.
isEarlyStartup
: true
variables
enabled
type
: boolean
fallbackPref
: browser.aboutwelcome.enabled
description
: >-
Should users see about:welcome? If this is false, users will see a
regular new tab instead.
id
type
: string
description
: >-
Descriptive ID for the about:welcome content
screens
type
: json
fallbackPref
: browser.aboutwelcome.screens
description
: Content to show in the onboarding flow
languageMismatchEnabled
type
: boolean
fallbackPref
: intl.multilingual.aboutWelcome.languageMismatchEnabled
description
: >-
Suggest to change the language on about:welcome when there is a mismatch with
the OS.
transitions
type
: boolean
description
: Enable transition effect between screens
backdrop
type
: string
fallbackPref
: browser.aboutwelcome.backdrop
description
: >-
Specify the color to be used to update the background color
toolbarButtonEnabled
type
: boolean
setPref
branch
: user
pref
: browser.aboutwelcome.toolbarButtonEnabled
description
: >-
Should the return to about:welcome toolbar button be shown
preonboarding
description
"A modal that shows on first startup, typically on top of about:welcome"
owner
: omc-core@mozilla.com
# Exposure is recorded by the spotlight feature used to show the modal
hasExposure
: false
# Needed at `sessionstore-windows-restored`.
isEarlyStartup
: true
variables
enabled
type
: boolean
fallbackPref
: browser.preonboarding.enabled
description
: >-
Should users see the preonboarding modal?
screens
type
: json
fallbackPref
: browser.preonboarding.screens
description
: Content to show in the onboarding flow
requireAction
type
: boolean
fallbackPref
: browser.preonboarding.requireAction
description
: >-
When showModal is enabled, should action be required to proceed (show as a window modal with dismiss using the ESC key disabled)?
currentVersion
type
: int
fallbackPref
: termsofuse.currentVersion
description
: >-
The current policy version displayed by this preonboarding modal.
minimumVersion
type
: int
fallbackPref
: termsofuse.minimumVersion
description
: >-
The minimum policy version which the user must have accepted to not see
the preonboarding modal. In some cases, the minimum version could be
lower than the current version if the newer version(s) is not
substantially different enough to warrant asking users to accept the TOU
again.
firstRunURL
type
: string
fallbackPref
: datareporting.policy.firstRunURL
description
: >-
URL of browser tab to be opened on first run instead of infobar.
moreFromMozilla
description
"New page on about:preferences to suggest more Mozilla products"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent once per browsing session when the about:preferences URL is
first accessed.
variables
enabled
type
: boolean
fallbackPref
: browser.preferences.moreFromMozilla
description
: Should users see the new more from Mozilla section.
template
type
: string
fallbackPref
: browser.preferences.moreFromMozilla.template
description
: UI template used to display Mozilla products. Possible values simple, advanced. Default is simple.
windowsLaunchOnLogin
description
"New checkbox in about:preferences startup section to start Firefox on Windows login"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent once per browsing session when the about:preferences URL is
first accessed.
variables
enabled
type
: boolean
setPref
branch
: default
pref
: browser.startup.windowsLaunchOnLogin.enabled
description
: Should users see the Windows launch on login checkbox.
firefoxBridge
description
"Controls for Firefox Bridge extension and extension registration"
owner
: install-update@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: browser.firefoxbridge.enabled
description
: >-
Should Firefox Bridge be registered within firefoxBridgeNativeMessaging
startup idle task for use with native messaging proxy.
abouthomecache
description
"The startup about:home cache."
owner
: omc-core@mozilla.com, mconley@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Is the feature enabled?
setPref
branch
: user
pref
: browser.startup.homepage.abouthome_cache.enabled
newtab
description
"The about:newtab page"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent once per browsing session when the first newtab page loads
(either about:newtab or about:home).
isEarlyStartup
: true
variables
newTheme
type
: boolean
description
: Enable the new theme
customizationMenuEnabled
type
: boolean
fallbackPref
: browser.newtabpage.activity-stream.customizationMenu.enabled
description
: Enable the customization panel inside of the newtab
prefsButtonIcon
type
: string
description
: Icon url to use for the preferences button
topSitesContileEnabled
type
: boolean
fallbackPref
: browser.topsites.contile.enabled
description
: Enable the Contile integration for Sponsored Top Sites
topSitesUseAdditionalTilesFromContile
type
: boolean
description
: Allow Contile to use additonal sponsored top sites
newtabAdSizingExperiment
description
: >-
Change the default ad size and UI for certain ad formats.
owner
: achurchwell@mozilla.com, sdowne@mozilla.com, mcrawford@mozilla.com
hasExposure
: false
variables
leaderboard
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabAdSize.leaderboard
description
: >-
Leaderboard ad size and UI.
leaderboard_position
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabAdSize.leaderboard.position
description
: >-
Leaderboard row position.
billboard
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabAdSize.billboard
description
: >-
Billboard ad size and UI.
billboard_position
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabAdSize.billboard.position
description
: >-
Billboard row position.
medium_rectangle
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabAdSize.mediumRectangle
description
: >-
Medium rectangle (MREC) ad size and UI.
newtabPromoCard
description
: the promo card that appears next to the ad banner
owner
: achurchwell@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Turns on and off the promo card.
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.promoCard.enabled
newtabAdsReporting
description
: about:newtab reporting ads feature
owner
: rhamoui@mozilla.com
hasExposure
: false
variables
reportAdsEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.reportAds.enabled
description
: >-
Enable reporting for ads
newtabContextualContent
description
: about:newtab contextual content feed
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
contextualContentEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.contextualContent.enabled
description
: >-
Override the contextual content enabled value set via region/locale
localeContextualContentConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.contextualContent.locale-content-config
description
: >-
A comma-separated list of locales that get contextual content by default.
regionContextualContentConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.contextualContent.region-content-config
description
: >-
A comma-separated list of regions that get contextual content by default.
contextualContentFeeds
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.contextualContent.feeds
description
: >-
CSV list of possible feeds for the contextual content feed
contextualContentSelectedFeed
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.contextualContent.selectedFeed
description
: >-
currently selected feed to display in the Contextual Content component
newtabCustomWallpaper
description
: >-
Modify the wallpaper selection feature to support user-uploaded custom wallpaper images
owner
: mcrawford@mozilla.com
hasExposure
: false
variables
uploadWallpaper
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.enabled
description
: >-
Turns on and off ability to upload a custom wallpaper.
colorPicker
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled
description
: >-
Turns on and off background color picker.
maxFileSizeEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.fileSize.enabled
description
: >-
Turns on and off maximum file size for uploaded images
maxFileSize
type
: int
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.customWallpaper.fileSize
description
: >-
Maximum file size (in MB) a user can upload
newtabInlineTopicSelection
description
: >-
Adds Inline topic selection to sections layout
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
TopicSelectionEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.interestPicker.enabled
description
: >-
Enables inline topic selection
newtabMarsOhttp
description
: Sending request to MARS over OHTTP in newtab
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.ohttp.enabled
description
: >-
Enables using OHTTP for unified ads API requests
newtabMerinoOhttp
description
: Sending request to merino over OHTTP in newtab
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.merino-provider.ohttp.enabled
description
: >-
Enables using OHTTP for merino content requests
newtabOhttpImages
description
: Sending request to MARS over OHTTP in newtab
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: >-
Enables using OHTTP for images
includeTopStoriesSection
type
: boolean
description
: >-
Enables using OHTTP for top stories section if enabled for images
newtabMobileDownloadPromotion
description
: Cross-sell promotion to download Firefox for mobile
owner
: mcrawford@mozilla.com
hasExposure
: false
variables
showModal
type
: boolean
description
: Display mobile download modal to users until dismissed
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.mobileDownloadModal.enabled
variantA
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.mobileDownloadModal.variant-a
description
: >-
Variant A modal message and QR code.
variantB
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.mobileDownloadModal.variant-b
description
: >-
Variant B modal message and QR code.
variantC
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.mobileDownloadModal.variant-c
description
: >-
Variant C modal message and QR code.
newtabPrivatePing
description
: The newtab-content ping, sent through OHTTP
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
privatePingEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.telemetry.privatePing.enabled
description
: >-
Enables the private newtab-content ping sent through OHTTP
redactNewtabPing
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.telemetry.privatePing.redactNewtabPing.enabled
description
: >-
Provides an option to redact content ids of users from click, impression and related events in the NewTab ping. Should be enabled when data colection has shefted to the more private NewTab_content ping.
includeInferredInterests
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.telemetry.privatePing.inferredInterests.enabled
description
: >-
Includes a differentially private intrest vector of general topical interests based on New Tab clicks. Only sent when user has enabled personalization.
maxSubmissionDelayMs
type
: int
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.telemetry.privatePing.maxSubmissionDelayMs
description
: >-
The maximum range for the random delay from scheduling the newtab-content ping to actually sending it. The minimum is 1000 by default. This is in milliseconds.
newtabPublisherFavicons
description
: Enabled publihser favicons on cards in newtab
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.publisherFavicon.enabled
description
: Enables publisher favicons on cards in newtab
newTabSectionsExperiment
description
: about:newtab section UI update
owner
: nbarrett@mozilla.com, mcrawford@mozilla.com
hasExposure
: false
variables
sectionsEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.enabled
description
: >-
Enable the Section UI for recommended stories on newtab
cardRefreshEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.cards.enabled
description
: >-
Enable the revised pocket story card UI in recommended stories on newtab
regionPersonalizationInferredConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.region-config
description
: >-
A comma-separated list of regions that use inferred personalization.
localePersonalizationInferredConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.locale-config
description
: >-
A comma-separated list of locales that use inferred personalization.
personalizationInferredEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.personalization.inferred.enabled
description
: >-
Enable the inferred personalization for topics
localeSectionstConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.locale-content-config
description
: >-
A comma-separated list of locales that get contextual content by default.
regionSectionsConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.region-content-config
description
: >-
A comma-separated list of regions that get contextual content by default.
sectionsPersonalization
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.personalization.enabled
description
: >-
Enable personalized sections layout. Allow users to follow/unfollow topic sections.
sectionsCustomizeMenuPanel
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.customizeMenuPanel.enabled
description
: >-
Enable personalized sections menu panel. Allow users to follow/unfollow topic sections.
sectionsContextualAdsEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.enabled
description
: >-
Enable contextual ads in sections.
regionSectionsContextualAdsConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.region-config
description
: >-
A comma-separated list of regions that get contextual ads by default.
localeSectionsContextualAdsConfig
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.sections.contextualAds.locale-config
description
: >-
A comma-separated list of locales that get contextual ads by default.
contextualSpocPlacements
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.contextualSpocs
description
: CSV string of spoc placement ids on newtab Pocket grid. A placement id tells our ad server where the ads are intended to be displayed.
contextualSpocCounts
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.contextualSpocs.counts
description
: CSV string of spoc placement counts on newtab Pocket grid. The count tells the ad server how many ads to return for this position and placement.
contextualBannerPlacements
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.contextualBanners
description
: CSV string of the banner placement ids on newtab Pocket grid. This placement id tells us which banner is visible when contexual ads are on.
contextualBannerCounts
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.contextualBanners.counts
description
: CSV string of AdBanner placement counts on newtab Pocket grid. The count tells the ad server how many banners to return for this position and placement.
newtabInferredPersonalization
description
: about:newtab inferred content personalization settings
owner
: rrando@mozilla.com
hasExposure
: false
variables
iv_refresh_frequency_hours
type
: int
description
: >-
Time to refresh interest vector in hours
history_cull_days
type
: int
description
: >-
Number of days local inferred feature history to preserve
normalized_time_zone_offset
type
: boolean
description
: >-
Include normalized (limited to common values) time zone offset in telemetry and requests
local_popular_today_rerank
type
: boolean
description
: >-
Whether to rerank popular today section using local interest vector
local_inferred_weight
type
: int
description
: >-
Relative rank of the local inferred model, will be normalized by 100
server_inferred_weight
type
: int
description
: >-
Relative rank of merino scores, will be normalized by 100
newtabSmartShortcuts
description
: about:newtab personalized shortcuts
owner
: rhamoui@mozilla.com, sdowne@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: >-
Enable personalized shortcuts
force_log
type
: boolean
description
: >-
Enable logging of shortcut interactions independent of ranking
over_sample_multiplier
type
: int
description
: >-
Controls how many multiples of the frecent we sample before reranking
positive_prior
type
: int
description
: >-
Alpha in shortcut thompson sampling, exploit faster
negative_prior
type
: int
description
: >-
Beta in shortcut thompson sampling, explore longer
thom_weight
type
: int
description
: >-
Percentage weight of thompson sampling
frec_weight
type
: int
description
: >-
Percentage weight of frecency
hour_weight
type
: int
description
: >-
Percentage weight of hourly seasonality
daily_weight
type
: int
description
: >-
Percentage weight of daily seasonality
bmark_weight
type
: int
description
: >-
Percentage weight of is_bookmark
rece_weight
type
: int
description
: >-
Percentage weight of recency
freq_weight
type
: int
description
: >-
Percentage weight of frequency
refre_weight
type
: int
description
: >-
Percentage weight of redone frecency
bias_weight
type
: int
description
: >-
Percentage weight for bias for computing final ranking
fset
type
: int
description
: >-
Key for smartshortcuts feature set
eta
type
: int
description
: >-
Learning rate for shortcut ranking weights, will divide by 10000
click_bonus
type
: int
description
: >-
bonus multiplier for clicks, will divide by 10
newtabSpocsCache
description
: The about:newtab sponsored content cache.
owner
: sdowne@mozilla.com
hasExposure
: false
variables
spocsCacheTimeout
type
: int
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.spocs.cacheTimeout
description
: >-
Set sponsored content cache timeout in minutes.
spocsStartupCache
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.spocs.startupCache.enabled
description
: >-
Controls if spocs should be included in startup cache.
newtabSponsoredContent
description
: >-
Change and control the sponsored content on newtab.
owner
: sdowne@mozilla.com
hasExposure
: false
variables
spocPositions
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.spoc-positions
description
: CSV string of spoc position indexes on newtab Pocket grid
spocPlacements
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.spocs
description
: CSV string of spoc placement ids on newtab Pocket grid. A placement id tells our ad server where the ads are intended to be displayed.
spocCounts
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.spocs.counts
description
: CSV string of spoc placement counts on newtab Pocket grid. The count tells the ad server how many ads to return for this position and placement.
tilesPlacements
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.tiles
description
: CSV string of tiles placement ids on newtab tiles section. A placement id tells our ad server where the ads are intended to be displayed.
tilesCounts
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.placements.tiles.counts
description
: CSV string of tiles placement counts on newtab tiles section. The count tells the ad server how many ads to return for this position and placement.
adsBackend
description
: Flags to affect ads backend behavior
owner
: efixler@mozilla.com
hasExposure
: false
allowCoenrollment
: true
variables
flags
type
: json
description
: JSON object of flag names and values to send to the ads backend
newtabTrainhop
description
: Experiment feature for the train-hopping newtab extension.
owner
: mconley@mozilla.com
hasExposure
: false
allowCoenrollment
: true
variables
type
type
: string
description
: A discriminant to tell different kinds of trainhop experiments apart.
payload
type
: json
description
: The experiment configuration.
newtabTrainhopAddon
description
: Enable download updated newtab resources packaged as an xpi
owner
: mconley@mozilla.com
hasExposure
: true
exposureDescription
: |
Exposure is sent when the trainhop addon version is in use (starting from the browser startup
right after it has been downloaded and installed).
variables
xpi_download_path
type
: string
description
: |
Provide the path (relative to the base URL set in the `browser.newtabpage.trainhopAddon.xpiBaseURL`
about:config pref) from which the xpi should be downloaded.
addon_version
type
: string
description
: |
Expected addon version (installing the xpi is cancelled if it mismatches the one set here).
The trainhop add-on version is also stored in an about:config pref, to be used on early
application startup to determine if the trainhop add-on version should be uninstalled
(and not be used for the newtab resources mapping to safely uninstall it later in the
same application session).
setPref
branch
: user
pref
: browser.newtabpage.trainhopAddon.version
newtabTrainhopFirstStartup
description
: |
Controls startup behaviours if and when a train-hop is available for a
fresh install.
owner
: mconley@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: |
True if New Tab should attempt to download, install and enable
train-hopped newtab XPIs for the first profile of new installs on
Windows. This is true by default, but can be set to false to disable.
newtabTopicSelection
description
: the about:newtab topic selection experience.
owner
: nbarrett@mozilla.com
hasExposure
: false
variables
availableTopics
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicSelection.topics
description
: >-
List of available topics to select for topic selection
suggestedTopics
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicSelection.suggestedTopics
description
: >-
List of pre-selected topics to display on first run of topic selection modal
topicSelectionOnboarding
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicSelection.onboarding.enabled
description
: >-
Turns on and off topic selection onbaording
regionTopicsConfig
description
: A comma-separated list of regions that get topics selection by default.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicSelection.region-topics-config
localeTopicsConfig
description
: A comma-separated list of locales that get topics selection by default.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicSelection.locale-topics-config
regionTopicLabelConfig
description
: A comma-separated list of regions that get topic labels by default.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicLabels.region-topic-label-config
localeTopicLabelConfig
description
: A comma-separated list of locales that get topic Labels by default.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.topicLabels.locale-topic-label-config
newtabUnifiedAds
description
: Mozilla Ad Routing Service (MARS) unified ads service
owner
: mcrawford@mozilla.com, sdowne@mozilla.com
hasExposure
: false
variables
unifiedAdsEndpoint
description
: The URL for the MARS API endpoint.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.endpoint
unifiedAdsSpocsEnabled
type
: boolean
description
: >-
Enable MARS endpoint to serve ads for recommended stories
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.spocs.enabled
unifiedAdsTilesEnabled
type
: boolean
description
: >-
Enable MARS endpoint to serve content for top sites tiles
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.tiles.enabled
unifiedAdsFeedEnabled
type
: boolean
description
: >-
Enable AdsFeed to manage all ads request/serving logic
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.adsFeed.enabled
unifiedAdsFeedTilesEnabled
type
: boolean
description
: >-
Enable AdsFeed to query MARS server to fetch/serve top sites tiles
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.unifiedAds.adsFeed.tiles.enabled
newtabWidgets
description
: about:newtab widgets feature
owner
: mcrawford@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: >-
Enable all widgets
listsEnabled
type
: boolean
description
: >-
Enable Lists widget
timerEnabled
type
: boolean
description
: >-
Enable Focus Timer widget
listsBadgeEnabled
type
: boolean
description
: >-
Show badge on Lists widget to indicate new/beta feature
listsBadgeLabel
type
: string
description
: >-
Label type for Lists widget badge (New or Beta)
pocketNewtab
description
: The Pocket section in newtab
owner
: sdowne@mozilla.com
hasExposure
: false
isEarlyStartup
: true
variables
contileTopsitesPositions
type
: string
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.contile-topsites-positions
description
: CSV string of contile position indexes on newtab topsites section
spocAdTypes
type
: string
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.spocAdTypes
description
: CSV string of data to set the spoc content.
spocZoneIds
type
: string
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.spocZoneIds
description
: CSV string of data to set the spoc content.
spocSiteId
type
: string
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.spocSiteId
description
: String ID to set the spoc content.
widgetPositions
type
: string
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.widget-positions
description
: CSV string of widget position indexes on newtab grid
hybridLayout
type
: boolean
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.hybridLayout.enabled
description
: Enable compact cards on newtab grid only for specific breakpoints
hideCardBackground
type
: boolean
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.hideCardBackground.enabled
description
: Removes Pocket card background and borders.
fourCardLayout
type
: boolean
fallbackPref
: browser.newtabpage.activity-stream.discoverystream.fourCardLayout.enabled
description
: Enable four Pocket cards per row.
newFooterSection
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.newFooterSection.enabled
description
: Enable an updated Pocket section topics footer
hideDescriptions
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.hideDescriptions.enabled
description
: >-
Hide or display descriptions for Pocket stories on newtab.
hideDescriptionsRegions
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.hideDescriptionsRegions
description
: >-
CSV string of regions that hide descriptions for Pocket stories on newtab.
compactGrid
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.compactGrid.enabled
description
: >-
Reduce the number of pixels between the Pocket cards on newtab.
compactImages
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.compactImages.enabled
description
: >-
Reduce the height on Pocket card images on newtab.
imageGradient
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.imageGradient.enabled
description
: >-
Add a gradient to the bottom of Pocket card images on newtab to blend the
image in with the card.
titleLines
type
: int
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.titleLines
description
: >-
Changes the maximum number of lines a title can be for Pocket cards on newtab.
descLines
type
: int
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.descLines
description
: >-
Changes the maximum number of lines a description can be for Pocket cards on newtab.
readTime
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.readTime.enabled
description
: >-
Displays an estimated read time for Pocket cards on newtab.
newSponsoredLabel
type
: boolean
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.newSponsoredLabel.enabled
description
: >-
Updates the sponsored label position to below the image for Pocket cards on newtab.
wallpapers
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.enabled
description
: >-
Turns on and off wallpaper support.
wallpapersHighlightEnabled
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.highlightEnabled
description
: >-
Turns on and off wallpaper feature highlight.
wallpaperHighlightHeaderText
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.highlightHeaderText
description
: >-
Changes the wallpaper feature highlight header
wallpaperHighlightContentText
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.highlightContentText
description
: >-
Changes the wallpaper feature highlight content
wallpaperHighlightCtaText
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.highlightCtaText
description
: >-
Changes the wallpaper feature highlight cta
currentWallpaper
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.newtabWallpapers.wallpaper
description
: >-
Changes the currently selected wallpaper
weatherLocationSearch
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.weather.locationSearchEnabled
description
: >-
Turns on and off location search for newtab weather widget
spocsEndpoint
description
: The URL for the spocs endpoint.
type
: string
setPref
branch
: user
pref
"browser.newtabpage.activity-stream.discoverystream.spocs-endpoint"
spocsEndpointAllowlist
description
: Comma separated list of allowed endpoints for fetching spocs
type
: string
setPref
branch
: user
pref
"browser.newtabpage.activity-stream.discoverystream.endpoints"
spocsClearEndpoint
description
: URL for deleting any server data when a user opts out of sponsored content
type
: string
setPref
branch
: user
pref
"browser.newtabpage.activity-stream.discoverystream.endpointSpocsClear"
ctaButtonSponsors
description
: A CSV list of sponsors that should use a button CTA.
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.ctaButtonSponsors
ctaButtonVariant
description
: Specifies which variant to use for any sponsors in ctaButtonSponsors
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.ctaButtonVariant
regionStoriesConfig
description
: A comma-separated list of region to get stories for.
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.region-stories-config
merinoProviderEndpoint
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.merino-provider.endpoint
description
: Merino endpoint to use for recommendations.
regionStoriesBlock
description
: A comma-separated list of regions that do not get stories, regardless of locale-list-config.
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.region-stories-block
localeListConfig
description
: A comma-separated list of locales that get stories, regardless of region-stories-config.
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.locale-list-config
regionSpocsConfig
description
: A comma-separated list of regions that get spocs by default.
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.region-spocs-config
regionWeatherConfig
description
: A comma-separated list of regions that get weather by default.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.region-weather-config
localeWeatherConfig
description
: A comma-separated list of locales that weather widget supports.
type
: string
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.locale-weather-config
topSitesMaxSponsored
# Defined under `pocketNewtab` as it needs to be used along with other variables
type
: int
description
: The maximum number of sponsored Top Sites to be displayed
topSitesContileMaxSponsored
# Defined under `pocketNewtab` as it needs to be used along with other variables
type
: int
description
: The maximum number of sponsored Top Sites used from Contile
pocketFeedParameters
type
: string
fallbackPref
: >-
browser.newtabpage.activity-stream.discoverystream.pocket-feed-parameters
description
: >-
Add parameters to Pocket feed URL.
merinoFeedExperiment
type
: boolean
setPref
branch
: user
pref
: browser.newtabpage.activity-stream.discoverystream.merino-feed-experiment
description
: >-
Should we pass the experiment branch and slug to the Merino feed request.
sessionRestore
description
: Session restore feature
owner
: sfoster@mozilla.com
hasExposure
: false
variables
startupBehavior
type
: int
setPref
branch
: user
pref
: browser.startup.page
description
: |
Should
we resume the previous session? Startup behavior is a choice of 4 possible values:
0 = open a blank tab,
1 = open the configured homepage in a tab (default, session restore disabled),
2 = open last visited page in a tab,
3 = re-open previous windows and tabs (session restore enabled)
screenshots
description
: The built-in Screenshots feature
owner
: sfoster@mozilla.com
hasExposure
: false
variables
buttonOnToolbarByDefault
type
: boolean
description
: The screenshots button will be placed on the toolbar by default.
password-autocomplete
description
: A special autocomplete UI for password fields.
owner
: sgalich@mozilla.com
hasExposure
: false
variables
directMigrateSingleProfile
type
: boolean
description
: Enable direct migration?
# This feature flag mirrors the one used for ios
address-autofill-feature
description
: Enabling address autofill feature
owner
: issozi@mozilla.com
hasExposure
: true
exposureDescription
"Exposure is sent when an address is autofilled."
variables
status
type
: boolean
setPref
branch
: default
pref
: extensions.formautofill.addresses.experiments.enabled
description
: If true, we will allow user to use address autofill
creditcards-autofill-enabled
description
: Credit card autofill is enabled in all regions
owner
: issozi@mozilla.com
hasExposure
: false
variables
creditcardsSupported
description
: Enable credit card autofill in all regions
type
: string
setPref
branch
: default
pref
: extensions.formautofill.creditCards.supported
shellService
description
"Interface with OS, e.g., pinning and set default"
owner
: desktop-integrations@mozilla.com
hasExposure
: false
variables
disablePin
type
: boolean
description
: Disable pin to taskbar feature
disableStartMenuPin
type
: boolean
setPref
branch
: user
pref
: browser.shell.disableStartMenuPin
description
: Disable pin to start menu feature
setDefaultBrowserUserChoice
type
: boolean
setPref
branch
: user
pref
: browser.shell.setDefaultBrowserUserChoice
description
: Should it set as default browser
setDefaultBrowserUserChoiceRegRename
type
: boolean
setPref
branch
: user
pref
: browser.shell.setDefaultBrowserUserChoice.regRename
description
: When setting default via UserChoice, rename the underlying registry key to prevent kennel driver registry locking.
setDefaultPDFHandler
type
: boolean
fallbackPref
: browser.shell.setDefaultPDFHandler
description
: Should setting it as the default browser set it as the default PDF handler.
setDefaultPDFHandlerOnlyReplaceBrowsers
type
: boolean
fallbackPref
: browser.shell.setDefaultPDFHandler.onlyReplaceBrowsers
description
: >-
Should setting it as the default PDF handler only replace existing PDF
handlers that are browsers, and not other PDF handlers such as Acrobat
Reader or Nitro PDF.
setDefaultGuidanceNotifications
type
: boolean
fallbackPref
: browser.shell.setDefaultGuidanceNotifications
description
: Whether or not the user should see the guidance notifications when setting Firefox as their default browser.
focusSetDefaultBrowserButton
description
: Focus the set default browser button in Windows Settings.
setPref
branch
: user
pref
: browser.shell.focusSetDefaultBrowserButton
type
: boolean
upgradeDialog
description
: The dialog shown for major upgrades
owner
: omc-core@mozilla.com
hasExposure
: false
isEarlyStartup
: true
variables
enabled
type
: boolean
fallbackPref
: browser.startup.upgradeDialog.enabled
description
: Is the feature enabled?
cfr
description
"A Firefox Messaging System message for the cfr message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
"moments-page"
description
"A Firefox Messaging System message for the moments-page message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
infobar
description
"A Firefox Messaging system message for the infobar message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
spotlight
description
"A Firefox Messaging System message for the spotlight message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
# Before 117, this feature only included one variable, pdfJsTourProgress. So,
# the minimum version for messaging experiments using this feature ID is 117.
featureCallout
description
"A Firefox Messaging System message for the Feature Callout message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
privacySecurityMessaging
description
: Supports experimental messaging related to privacy and security.
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent when a milestone doorhanger message is seen or when the
milestone section of the protections popup is seen.
variables
blockingMilestoneMessagingEnabled
type
: boolean
setPref
branch
: user
pref
: browser.contentblocking.cfr-milestone.enabled
description
: >-
Enable messaging related to content blocking milestones. Setting to
false disables both the milestone doorhanger and the milestone section
of the protections popup.
blockingMilestones
type
: string
setPref
branch
: user
pref
: browser.contentblocking.cfr-milestone.milestones
description
: >-
A JSON array of milestones to trigger messaging for. Milestones are
defined as the number of times a user has had tracking content blocked,
e.g., [1000, 5000, 10000...]. See the pref for default values. The list
should typically have 7 entries, because the built-in milestone messages
are allowed to show 7 times. If you want more or fewer milestones, you
should override the milestone messages by also including a messaging
feature in your experiment, so you can include a replacement message
with a frequency cap matching the number of milestones. Use a feature
like fxms-message-* to do that.
blockingMilestoneUpdateInterval
type
: int
setPref
branch
: user
pref
: browser.contentblocking.cfr-milestone.update-interval
description
: >-
How often (in milliseconds) we check if the user is eligible for seeing
a milestone doorhanger. 24 hours by default.
fullPageTranslation
description
: This feature opens a popup panel to offer to translate a page.
owner
: gtatum@mozilla.com
hasExposure
: false
variables
boolean
description
: Set to true to enable the translations feature
type
: boolean
setPref
branch
: user
pref
: browser.translations.enable
fullPageTranslationAutomaticPopup
description
: Controls whether the popup automatically shows for translations.
owner
: gtatum@mozilla.com
hasExposure
: false
variables
boolean
description
: Set to true to automatically popup, and false to only show the button.
type
: boolean
setPref
branch
: user
pref
: browser.translations.automaticallyPopup
selectTranslation
description
: This feature enables the option to translate selected text from the context menu.
owner
: enordin@mozilla.com
hasExposure
: false
variables
enabled
description
: Set to true to enable the select-translations feature
type
: boolean
setPref
branch
: user
pref
: browser.translations.select.enable
translationsQuickAction
description
: This feature enables the translations quick action in the URL bar.
owner
: enordin@mozilla.com
hasExposure
: false
variables
enabled
description
: Set to true to enable the translations quick action feature.
type
: boolean
setPref
branch
: user
pref
: browser.translations.quickAction.enabled
pdfjs
description
: The Firefox pdf reader.
owner
: pdfjs-team@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent each time a pdf is displayed.
variables
enableAltText
description
: Set to true to enable alt text generation.
type
: boolean
setPref
branch
: default
pref
: pdfjs.enableAltText
enableUpdatedAddImage
description
: Set to true to enable updated add image with alt text flow.
type
: boolean
setPref
branch
: default
pref
: pdfjs.enableUpdatedAddImage
browserMlEnable
description
: Set to true to enable local inference engine
type
: boolean
setPref
branch
: default
pref
: browser.ml.enable
enableSignatureEditor
description
: Set to true to enable the signature editor
type
: boolean
setPref
branch
: default
pref
: pdfjs.enableSignatureEditor
# fxms-message-* placeholder feature ids
# has info on using these placeholder feature ids, as well as (very short) instructions on
# checking to see if we need more (which we do once per Nightly) and how to add them.
# Instructions for adding a new fxms-message-* placeholder feature id
# 1) clone an existing one here
# 2) update the YAML feature id to the next unused number
# 3) update the YAML description; include what versions can be targeted on this feature ID
# 4) add the new feature id to MESSAGING_EXPERIMENTS_DEFAULT_FEATURES list in MessagingExperimentConstants.sys.mjs
# 5) add a new corresponding reach metric to /toolkit/components/messaging-system/metrics.yaml
# 6) add the new feature id to the `messaging_experiments` > `reach` > `objects` list in /toolkit/telemetry/Events.yaml
# 7) add the new feature id and the version it landed in to the spreadsheet tab linked to above
fxms-message-1
description
"A Firefox Messaging System message"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-2
description
"Firefox Messaging System message 2"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-3
description
"Firefox Messaging System message 3"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-4
description
"Firefox Messaging System message 4"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-5
description
"Firefox Messaging System message 5"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-6
description
"Firefox Messaging System message 6"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-7
description
"Firefox Messaging System message 7"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-8
description
"Firefox Messaging System message 8"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-9
description
"Firefox Messaging System message 9"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-10
description
"Firefox Messaging System message 10"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-11
description
"Firefox Messaging System message 11"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-12
description
"Firefox Messaging System message 12 - ONLY for Fx140+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-13
description
"Firefox Messaging System message 13 - ONLY for Fx140+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-14
description
"Firefox Messaging System message 14 - ONLY for Fx140+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-15
description
"Firefox Messaging System message 15 - ONLY for Fx140+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-16
description
"Firefox Messaging System message 16 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-17
description
"Firefox Messaging System message 17 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-18
description
"Firefox Messaging System message 18 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-19
description
"Firefox Messaging System message 19 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-20
description
"Firefox Messaging System message 20 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-21
description
"Firefox Messaging System message 21 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-22
description
"Firefox Messaging System message 22 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-23
description
"Firefox Messaging System message 23 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-24
description
"Firefox Messaging System message 24 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
fxms-message-25
description
"Firefox Messaging System message 25 - ONLY for Fx144+ targeting"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
whatsNewPage
description
"A Firefox Messaging System message for the What's new page channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
variables
overrideUrl
description
: URL of the What
's new page
type
: string
setPref
branch
: user
pref
: startup.homepage_override_url_nimbus
maxVersion
description
: Maximum Firefox update version
type
: string
setPref
branch
: user
pref
: startup.homepage_override_nimbus_maxVersion
minVersion
description
: Minimum Firefox update version
type
: string
setPref
branch
: user
pref
: startup.homepage_override_nimbus_minVersion
disableWNP
description
: >-
Block all What
's New Pages. Used to compare no-WNP control branches to
WNP treatment branches.
type
: boolean
setPref
branch
: user
pref
: startup.homepage_override_nimbus_disable_wnp
pbNewtab
description
"A Firefox Messaging System message for the pbNewtab message channel"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched.
schema
uri
chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json"
variables
: {}
backgroundTaskMessage
description
"A Firefox Messaging System message for the background task message channel"
owner
: nalexander@mozilla.com
applications
- firefox-desktop-background-task
hasExposure
: true
exposureDescription
: >-
Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched.
schema
uri
chrome://browser/content/asrouter/schemas/BackgroundTaskMessagingExperiment.schema.json
path
"browser/components/asrouter/content-src/schemas/BackgroundTaskMessagingExperiment.schema.json"
variables
: {}
backgroundUpdateAutomaticRestart
description
"Whether to automatically restart when the background update task could make more progress."
owner
: nalexander@mozilla.com
applications
- firefox-desktop-background-task
hasExposure
: false
variables
enabled
type
: boolean
fallbackPref
: app.update.background.automaticRestartEnabled
description
: >-
When true, make the background update task restart when the final update state is `READY_FOR_RESTART`.
Generally, this will finish applying a staged update, completing the update earlier than it
otherwise would have been completed.
backgroundUpdateCheckPolicy
description
: >-
Control when to
'allow'
and when to
'throttle'
the background update task so
that the task runs but does not necessarily check for updates. The check
policy allows to tell the background update task to not check for, download,
and apply, updates in certain situations, thereby reducing update-related
operational costs. It also allows to limit the number of actions taken in
any given interval, thereby reducing user resource usage and Nimbus-related
operational costs.
owner
: install-update@mozilla.com
applications
- firefox-desktop-background-task
hasExposure
: false
variables
throttleEnabled
type
: boolean
fallbackPref
: app.update.background.checkPolicy.throttleEnabled
description
: >-
When true, the background update task will
'throttle'
itself and not
necessarily check for updates.
throttleAfterDays
type
: int
fallbackPref
: app.update.background.checkPolicy.throttleAfterDays
description
: >-
When greater than or equal to 0, the number of consecutive days that the
background update task will run and check for updates when the task has
not
witnessed a Firefox browsing profile running. N.b.: when 0, this
will disable the background update task checking for updates entirely.
throttleDebouncePeriodInHours
type
: int
fallbackPref
: app.update.background.checkPolicy.throttleDebouncePeriodInHours
description
: >-
When greater than 0, limit the background update task, when it is
throttled, from taking any action at all to at most one (1) time in
every
"period"
hours. That is, if `throttledDebouncePeriodInHours=24`
and the background update task executes at time `t0`, then the
background update task will exit without further action every invocation
at time `t1 < t0 + 24 hours`.
pictureinpicture
description
: Message for first time Picture-in-Picture users
owner
: nbaumgardner@mozilla.com
hasExposure
: true
exposureDescription
: Exposure is sent when a user hovers over a video and Picture-in-Picture has not been used before
variables
title
type
: string
description
: The title to be used for the PiP toggle
message
type
: string
description
: The message to be used in the PiP toggle
showIconOnly
type
: boolean
description
: Whether to show the first time PiP toggle or show the PiP icon only
oldToggle
type
: boolean
description
: Whether to show the control style (true) or variant style (false) for the first time PiP toggle
displayDuration
type
: int
description
: Duration of PiP first time toggle display in days before switching to PiP icon toggle
glean
description
"The Glean data-control-plane feature within Firefox Desktop for controlling metric configuration"
owner
: glean-team@mozilla.com
applications
- firefox-desktop
- firefox-desktop-background-task
hasExposure
: false
allowCoenrollment
: true
variables
gleanMetricConfiguration
type
: json
description
: |
A map of metric base-identifiers to booleans representing the state of the
'enabled'
flag for that metric.
This variable is intended for interacting with the Glean data-control-plane via the Server Knobs functionality
to remotely configure metrics to be enabled or disabled.
gleanInternalSdk
description
"The Glean internal SDK feature intended only for internal Glean Team use"
owner
: glean-team@mozilla.com
applications
- firefox-desktop
- firefox-desktop-background-task
hasExposure
: false
variables
finalInactive
type
"boolean"
description
"Enables FOG early shutdown pings when true"
setPref
branch
: user
pref
: telemetry.glean.internal.finalInactive
gleanMetricConfiguration
type
: json
description
: |
A map of metric base-identifiers to booleans representing the state of the
'enabled'
flag for that metric.
This is not for public use! For data-control-plane use, please refer to the Glean documentation and use the
`gleanMetricConfiguration` found in the `glean` feature for this.
gleanMaxPingsPerMinute
type
: int
description
: >-
Maximum number of pings that can be sent in a 60 second interval
setPref
branch
: user
pref
: telemetry.glean.internal.maxPingsPerMinute
legacyTelemetry
description
"Controls for the Legacy Telemetry data collection system"
owner
: chutten@mozilla.com
applications
- firefox-desktop
hasExposure
: false
variables
disabledPings
type
: json
description
: |
A list of Legacy Telemetry pings to disable.
Pings on this list will not be archived or uploaded.
On submit their payloads will be dropped.
Code that collects to and submits the ping will still operate as normal.
Cannot be used to disable the
"main"
"first-shutdown"
"new-profile"
or
"deletion-request"
pings.
disableMainPingScalars
type
: boolean
description
: |
If true, scalars will not be included in
"main"
pings.
Exceptions
are made for two important engagement measures:
`browser.engagement.total_uri_count_normal_and_private_mode` and
`browser.engagement.active_ticks`.
These scalars will continue to be reported as normal, even if all
others are disabled by this variable.
disableMainPingHgrams
type
: boolean
description
: |
If true, histograms will not be included in
"main"
pings.
Data will still be recorded locally,
it will merely not be included in
"main"
pings when they are submitted.
browserLowMemoryPrefs
description
: Prefs which control the browser
's behaviour under low memory.
owner
: haftandilian@mozilla.com
hasExposure
: false
variables
lowMemoryResponseMask
description
: Control the response on macOS when under memory pressure.
type
: int
setPref
branch
: default
pref
"browser.lowMemoryResponseMask"
lowMemoryResponseOnWarn
description
: Controls which macOS memory-pressure levels trigger the browser low memory response.
type
: boolean
setPref
branch
: default
pref
"browser.lowMemoryResponseOnWarn"
tabsUnloadOnLowMemory
description
: Whether to unload tabs when available memory is running low.
type
: boolean
setPref
branch
: default
pref
"browser.tabs.unloadOnLowMemory"
echPrefs
description
: Prefs that control Encrypted Client Hello.
owner
: djackson@mozilla.com
hasExposure
: false
variables
tlsEnabled
description
: Whether to enable ECH for connections using TLS
type
: boolean
setPref
branch
: default
pref
"network.dns.echconfig.enabled"
h3Enabled
description
: Whether to enable ECH for connections using H3/QUIC
type
: boolean
setPref
branch
: default
pref
"network.dns.http3_echconfig.enabled"
forceWaitHttpsRR
description
: Whether to force waiting for HTTPS DNS records, which ECH requires.
type
: boolean
setPref
branch
: default
pref
"network.dns.force_waiting_https_rr"
insecureFallback
description
: Whether to fallback to non-ECH connections if all ECH RRs fail.
type
: boolean
setPref
branch
: default
pref
"network.dns.echconfig.fallback_to_origin_when_all_failed"
tlsGreaseProb
description
: Probability of GREASEing a TLS connection with ECH (0-100).
type
: int
setPref
branch
: default
pref
"security.tls.ech.grease_probability"
h3GreaseEnabled
description
: Whether to apply GREASE settings to H3/QUIC connections.
type
: boolean
setPref
branch
: default
pref
"security.tls.ech.grease_http3"
disableGreaseOnFallback
description
: Whether to disable GREASE when retrying a connection.
type
: boolean
setPref
branch
: default
pref
"security.tls.ech.disable_grease_on_fallback"
greasePaddingSize
description
: Assumed echConfig padding length for GREASE extensions (1-255).
type
: int
setPref
branch
: default
pref
"security.tls.ech.grease_size"
dohPrefs
description
: Prefs that control DNS over HTTPS.
owner
: vgosu@mozilla.com
hasExposure
: false
variables
trrMode
description
: Has a value of 2 for TRR first, 3 for TRR only, 0 for off.
type
: int
setPref
branch
: default
pref
"network.trr.mode"
trrUri
description
: The URL of the DNS over HTTPS endpoint
type
: string
setPref
branch
: default
pref
"network.trr.uri"
dohMode
description
: Same as trrMode, but set by the DoHController module.
type
: int
setPref
branch
: default
pref
"doh-rollout.mode"
dohUri
description
: Same as trrUri, but set by the DoHController module.
type
: string
setPref
branch
: default
pref
"doh-rollout.uri"
dohProviderList
description
: An override of the rollout provider-list json
type
: string
setPref
branch
: default
pref
"doh-rollout.provider-list"
dohProviderSteeringList
description
: An override of the rollout steering provider-list json
type
: string
setPref
branch
: default
pref
"doh-rollout.provider-steering.provider-list"
nativeHTTPSRecords
description
: Whether we can perform native DNS HTTPS lookups
type
: boolean
setPref
branch
: default
pref
"network.dns.native_https_query"
dooh
description
"DNS over Oblivious HTTP"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
ohttpEnabled
description
: Whether to use Oblivious HTTP for the resolution
type
: boolean
setPref
branch
: default
pref
"network.trr.use_ohttp"
ohttpRelayUri
description
: The URL of the Oblivious HTTP relay
type
: string
setPref
branch
: default
pref
"network.trr.ohttp.relay_uri"
ohttpConfigUri
description
: The URL used to fetch the configuration of the Oblivious HTTP gateway
type
: string
setPref
branch
: default
pref
"network.trr.ohttp.config_uri"
ohttpUri
description
: The URL of the Oblivious DNS over HTTPS target resource
type
: string
setPref
branch
: default
pref
"network.trr.ohttp.uri"
networking
description
"Firefox Networking (Necko)"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
preconnect
description
: Whether the rel=preconnect feature is enabled
type
: boolean
setPref
branch
: default
pref
"network.preconnect"
http3CCalgorithm
description
: The congestion control algorithm with which to configure neqo. 0 for NewReno, 1 for Cubic
type
: int
setPref
branch
: default
pref
"network.http.http3.cc_algorithm"
http3SlowStartAlgorithm
description
: The slow start algorithm with which to configure neqo. Use 0 for Classic, 1 for HyStart++.
type
: int
setPref
branch
: default
pref
"network.http.http3.slow_start_algorithm"
enableOffMainThreadStreamDecompression
description
: Whether to enable decompression of network streams off-main-thread
type
: boolean
setPref
branch
: default
pref
"network.decompression_off_mainthread2"
offMainThreadStreamDecompressionThreshold
description
: Minimum content length for off-main-thread decompression
type
: int
setPref
branch
: default
pref
"network.decompression_off_mainthread_min_size"
dnsGracePeriod
description
: The grace period allows the DNS cache to use expired entries, while kicking off a revalidation in the background.
type
: int
setPref
branch
: default
pref
"network.dnsCacheExpirationGracePeriod"
http3UseNSPRForIO
description
: true by default using legacy UDP IO via NSPR. When set to false, uses new UDP IO via Fast UDP for Firefox project.
type
: boolean
setPref
branch
: default
pref
"network.http.http3.use_nspr_for_io"
prefetchNext
description
: Enables the prefetch service (i.e., prefetching of "next"
> and "prefetch"
> URLs).
type
: boolean
setPref
branch
: default
pref
"network.prefetch-next"
networkingEarlyHints
description
"Networking (Necko) Early Hints"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
ehPreloadEnabled
description
: Whether Early Hints preload is enabled
type
: boolean
setPref
branch
: default
pref
"network.early-hints.enabled"
ehPreconnectEnabled
description
: Whether Early Hints preconnect is enabled
type
: boolean
setPref
branch
: default
pref
"network.early-hints.preconnect.enabled"
networkingDNS
description
"Networking (Necko) DNS"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
dnsMaxPriorityThreads
description
: The maximum number of high priority DNS threads that can be created.
type
: int
setPref
branch
: default
pref
"network.dns.max_high_priority_threads"
dnsMaxAnyPriorityThreads
description
: The maximum number of DNS threads that can be created to handle any priority DNS requests.
type
: int
setPref
branch
: default
pref
"network.dns.max_any_priority_threads"
maxDnsCacheEntries
description
: This is the number of dns cache entries allowed
type
: int
setPref
branch
: default
pref
"network.dnsCacheEntries"
networkingConnections
description
"Networking (Necko) Connections"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
httpMaxConnections
description
: The maximum number of http connections.
type
: int
setPref
branch
: default
pref
"network.http.max-connections"
httpMaxPersistentConnectionsPerServer
description
: The maximum number of persistent connections to a server
type
: int
setPref
branch
: default
pref
"network.http.max-persistent-connections-per-server"
httpMaxUrgentStartExcessiveConnectionsPerHost
description
: Number of connections that we can open beyond the standard parallelism limit defined by max-persistent-connections-per-server/-proxy to handle urgent-start marked requests.
type
: int
setPref
branch
: default
pref
"network.http.max-urgent-start-excessive-connections-per-host"
speculativeConnectionLimit
description
: The maximum number of half-open sockets allowed for speculative connections
type
: int
setPref
branch
: default
pref
"network.http.speculative-parallel-limit"
happyEyeballsEnabled
description
: Whether to enable the Happy Eyeballs v3 algorithm for connection establishment
type
: boolean
setPref
branch
: default
pref
"network.http.happy_eyeballs_enabled"
networkingSendOnDataFinished
description
"Networking (Necko) OnDataFinished"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
sendOnDataFinished
description
: Whether we can send OnDataFinished in the content process
type
: boolean
setPref
branch
: default
pref
"network.send_OnDataFinished"
sendOnDataFinishedFromInputStreamPump
description
: Whether we can send OnDataFinished to the content process from InputStreamPump
type
: boolean
setPref
branch
: default
pref
"network.send_OnDataFinished.nsInputStreamPump"
sendOnDataFinishedToHtml5parser
description
: Whether we can send OnDataFinished to the html5parser in content process
type
: boolean
setPref
branch
: default
pref
"network.send_OnDataFinished.html5parser"
sendOnDataFinishedToCssLoader
description
: Whether we can send OnDataFinished to the cssLoader in content process
type
: boolean
setPref
branch
: default
pref
"network.send_OnDataFinished.cssLoader"
networkingBannedPorts
description
"Networking (Necko) Banned Ports"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
bannedPortList
description
: A comma-separated list of ports that Firefox will refuse to connect to. These ports will be appended to nsIOService gBadPortList
type
: string
setPref
branch
: default
pref
"network.security.ports.banned"
localNetworkAccess
description
"Networking (Necko) Local Network Access prefs"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
enableLNAWithETPStrict
description
: Whether to enable LNA restrictions in ETP Strict Mode
type
: boolean
setPref
branch
: default
pref
"network.lna.etp.enabled"
blockTrackers
description
: Whether network requests triggered by third party scripts classified as trackers should be blocked when making a localhost request.
type
: boolean
setPref
branch
: default
pref
"network.lna.block_trackers"
lnaPromptsEnabled
description
: Whether we should prompt users for permission whenever we detect local network access.
type
: boolean
setPref
branch
: default
pref
"network.lna.blocking"
lnaFeatureEnabled
description
: Blanket flag to enable/disable LNA sub-features.
type
: boolean
setPref
branch
: default
pref
"network.lna.enabled"
essentialFallbackDomains
description
"Whether to retry failing system requests with a backup domain"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
essentialDomainsEnabled
description
: Whether to retry with a backup domain indicated in remote-settings
type
: boolean
setPref
branch
: default
pref
"network.essential_domains_fallback"
disableHttp3
description
"Whether HTTP/3 is disabled"
owner
: kershaw@mozilla.com
hasExposure
: false
variables
withThirdPartyRoots
description
: If third party roots are detected, disable HTTP/3
type
: boolean
setPref
branch
: default
pref
"network.http.http3.disable_when_third_party_roots_found"
networkPrioritization
description
"Network request prioritization"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
priorityHeader
description
: Whether to set the Priority header on each request.
type
: boolean
setPref
branch
: default
pref
"network.http.priority_header.enabled"
fetchPriority
description
: Whether fetch priority is enabled
type
: boolean
setPref
branch
: default
pref
"network.fetchpriority.enabled"
h3FetchPriority
description
: Whether to send HTTP3 priority frames
type
: boolean
setPref
branch
: default
pref
"network.http.http3.priority"
sendNoRFC7540Setting
description
: Whether to send the SETTINGS_NO_RFC7540_PRIORITIES for the HTTP2 session.
type
: boolean
setPref
branch
: default
pref
"network.http.http2.send_NO_RFC7540_PRI"
h2deps
description
: Whether RFC7540 priorities / stream dependencies are enabled
type
: boolean
setPref
branch
: default
pref
"network.http.http2.enabled.deps"
h3BackgroundTabDeprioritization
description
: Lowers the priority when the tab is in the background. Potential privacy concerns.
type
: boolean
setPref
branch
: default
pref
"network.http.http3.send_background_tabs_deprioritization"
documentPriorityIncremental
description
: Sets the incremental flag on the Priority header for document requests
type
: boolean
setPref
branch
: default
pref
"dom.document_priority.incremental"
imagePriorityIncremental
description
: Sets the incremental flag on the Priority header for image requests
type
: boolean
setPref
branch
: default
pref
"image.priority.incremental"
imageAdjustLayoutPriority
description
: Whether the network request priority should be adjusted according the layout and view frame position of each particular image.
type
: boolean
setPref
branch
: default
pref
"image.layout_network_priority"
adjustLinkPreloadScriptLow
description
: Priority adjustment low for link-preload-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-script.low"
adjustLinkPreloadScriptHigh
description
: Priority adjustment high for link-preload-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-script.high"
adjustLinkPreloadScriptAuto
description
: Priority adjustment auto for link-preload-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-script.auto"
adjustModuleScriptLow
description
: Priority adjustment low for module-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.module-script.low"
adjustModuleScriptHigh
description
: Priority adjustment high for module-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.module-script.high"
adjustModuleScriptAuto
description
: Priority adjustment auto for module-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.module-script.auto"
adjustAsyncOrDeferScriptLow
description
: Priority adjustment low for async-or-defer-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.async-or-defer-script.low"
adjustAsyncOrDeferScriptHigh
description
: Priority adjustment high for async-or-defer-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.async-or-defer-script.high"
adjustAsyncOrDeferScriptAuto
description
: Priority adjustment auto for async-or-defer-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.async-or-defer-script.auto"
adjustScriptInHeadLow
description
: Priority adjustment low for script-in-head
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.script-in-head.low"
adjustScriptInHeadHigh
description
: Priority adjustment high for script-in-head
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.script-in-head.high"
adjustScriptInHeadAuto
description
: Priority adjustment auto for script-in-head
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.script-in-head.auto"
adjustOtherScriptLow
description
: Priority adjustment low for other-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.other-script.low"
adjustOtherScriptHigh
description
: Priority adjustment high for other-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.other-script.high"
adjustOtherScriptAuto
description
: Priority adjustment auto for other-script
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.other-script.auto"
adjustLinkPreloadFontLow
description
: Priority adjustment low for link-preload-font
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-font.low"
adjustLinkPreloadFontHigh
description
: Priority adjustment high for link-preload-font
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-font.high"
adjustLinkPreloadFontAuto
description
: Priority adjustment auto for link-preload-font
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-font.auto"
adjustLinkPreloadFetchLow
description
: Priority adjustment low for link-preload-fetch
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-fetch.low"
adjustLinkPreloadFetchHigh
description
: Priority adjustment high for link-preload-fetch
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-fetch.high"
adjustLinkPreloadFetchAuto
description
: Priority adjustment auto for link-preload-fetch
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-fetch.auto"
adjustDeferredStyleLow
description
: Priority adjustment low for deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.deferred-style.low"
adjustDeferredStyleHigh
description
: Priority adjustment high for deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.deferred-style.high"
adjustDeferredStyleAuto
description
: Priority adjustment auto for deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.deferred-style.auto"
adjustLinkPreloadStyleLow
description
: Priority adjustment low for link-preload-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-style.low"
adjustLinkPreloadStyleHigh
description
: Priority adjustment high for link-preload-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-style.high"
adjustLinkPreloadStyleAuto
description
: Priority adjustment auto for link-preload-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.link-preload-style.auto"
adjustNonDeferredStyleLow
description
: Priority adjustment low for non-deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.non-deferred-style.low"
adjustNonDeferredStyleHigh
description
: Priority adjustment high for non-deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.non-deferred-style.high"
adjustNonDeferredStyleAuto
description
: Priority adjustment auto for non-deferred-style
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.non-deferred-style.auto"
adjustGlobalFetchApiLow
description
: Priority adjustment low for global-fetch-api
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.global-fetch-api.low"
adjustGlobalFetchApiHigh
description
: Priority adjustment high for global-fetch-api
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.global-fetch-api.high"
adjustGlobalFetchApiAuto
description
: Priority adjustment auto for global-fetch-api
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.global-fetch-api.auto"
adjustImagesLow
description
: Priority adjustment low for images
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.images.low"
adjustImagesHigh
description
: Priority adjustment high for images
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.images.high"
adjustImagesAuto
description
: Priority adjustment auto for images
type
: int
setPref
branch
: default
pref
"network.fetchpriority.adjustments.images.auto"
lowerTrackersPriority
description
: Whether to lower priority of resources on the tracking protection list
type
: boolean
setPref
branch
: default
pref
"privacy.trackingprotection.lower_network_priority"
enableHttpTailing
description
: Whether certain requests, mainly trackers, are put to the
"tail"
, behind other requests
type
: boolean
setPref
branch
: default
pref
"network.http.tailing.enabled"
httpTailingUrgency
description
: Priority urgency of tailed request
type
: int
setPref
branch
: default
pref
"network.http.tailing.urgency"
httpTailingDelayQuantum
description
: When the page load has not yet reached DOMContentLoaded point, tail requestes are delayed by (non-tailed requests count + 1) * delay-quantum milliseconds.
type
: int
setPref
branch
: default
pref
"network.http.tailing.delay-quantum"
httpTailingDelayQuantumAfterDCL
description
: After the page load reached DOMContentLoaded point, tail requestes are delayed by (non-tailed requests count + 1) * delay-quantum-after-domcontentloaded milliseconds.
type
: int
setPref
branch
: default
pref
"network.http.tailing.delay-quantum-after-domcontentloaded"
httpTailingMaxDelay
description
: Upper limit for the calculated delay, prevents long standing and comet-like requests
type
: int
setPref
branch
: default
pref
"network.http.tailing.delay-max"
httpTailingTotalMaxDelay
description
: Total limit we delay tailed requests since page load start
type
: int
setPref
branch
: default
pref
"network.http.tailing.total-max"
networkingAuth
description
"Firefox Networking (Necko) Authentication"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
redirectForAuthRetriesEnabled
description
: Whether to enable redirects for auth retries
type
: boolean
setPref
branch
: default
pref
"network.auth.use_redirect_for_retries"
networkingDenyIpAddrAny
description
"Firefox Networking (Necko) Deny IP Address Any"
owner
: vgosu@mozilla.com
hasExposure
: false
variables
denyIpAddrAny
description
: Whether to deny empty (0.0.0.0) IP addresses
type
: boolean
setPref
branch
: default
pref
: network.socket.ip_addr_any.disabled
compressionDictionaries
description
: HTTP Compression Dictionaries
owner
: rjesup@mozilla.com
hasExposure
: false
variables
enableDictionaries
description
: Enables/disables HTTP Compression Dictionaries
type
: boolean
setPref
branch
: default
pref
: network.http.dictionaries.enable
pingsender
description
"In-product usage of the pingsender telemetry reporter."
owner
: nalexander@mozilla.com
hasExposure
: false
variables
backgroundTaskEnabled
type
"boolean"
fallbackPref
"toolkit.telemetry.shutdownPingSender.backgroundtask.enabled"
description
"Whether to use the `pingsender` background task to send shutdown telemetry"
dapTelemetry
description
: DAP Telemetry
owner
: simon@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether to automatically send DAP measurements.
task1Enabled
type
: boolean
description
: Whether to send fake measurements for task 1.
task1TaskId
type
: string
description
: The task ID to use for task 1 measurements.
visitCountingEnabled
type
: boolean
description
: Whether to count visits to the provided list of URLs.
visitCountingExperimentList
type
: json
description
: A list of experiments with URLs for which we want to count visits.
dapIncrementality
description
"Incrementality experiment configuration"
owner
: gleonard@mozilla.com
hasExposure
: false
variables
measurementType
type
: string
description
: Indicates the type of measurement to enable. Valid values are `visitMeasurement`, `referrerMeasurement`.
advertiser
type
: string
description
: The advertiser being measured.
taskId
type
: string
description
: The DAP taskId specified for report submission.
length
type
: int
description
: The number of buckets needed for the report histogram.
timePrecision
type
: int
description
: The time precision (seconds) for submitted report. Must match the time-precision value for the task with the specified taskId.
visitCountUrls
type
: json
description
: Used for measurementType `visitMeasurement`. JSON indicating the url (string), bucket (int), and metric_name(string).
referrerUrls
type
: json
description
: Used for measurementType `referrerMeasurement`. JSON indicating the url (string), bucket (int), and metric_name(string) The url pattern should be broad.
targetUrls
type
: string
description
: Used for measurementType `referrerMeasurement`. Comma separated list of URLs to measure.
unknownReferrerBucket
type
: int
description
: Used for measurementType `referrerMeasurement`. Histogram bucket indicating unknown referrer, may be null.
unknownReferrerMetricName
type
: string
description
: Used for measurementType `referrerMeasurement`. Metric name indicating count of unknown referrer occurrences, may be null.
dapAggregators
description
: Aggregator server configuration to use for submitting DAP reports.
owner
: tcampbell@mozilla.com
hasExposure
: false
variables
leader_url
description
: The URL of the DAP Leader server where reports are submitted.
type
: string
setPref
branch
: default
pref
"toolkit.telemetry.dap.leader.url"
leader_hpke
description
: The base64-encode HPKE key to encrypt leader shares with.
type
: string
setPref
branch
: default
pref
"toolkit.telemetry.dap.leader.hpke"
helper_url
description
: The URL of the DAP Helper server.
type
: string
setPref
branch
: default
pref
"toolkit.telemetry.dap.helper.url"
helper_hpke
description
: The base64-encode HPKE key to encrypt helper shares with.
type
: string
setPref
branch
: default
pref
"toolkit.telemetry.dap.helper.hpke"
etpLevel2PBMPref
description
: The pref that controls the ETP level 2 list in the private browsing mode
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabled
description
: Whether to enable ETP level 2 list in the private browsing mode.
type
: boolean
setPref
branch
: default
pref
"privacy.annotate_channels.strict_list.pbmode.enabled"
etpStrictFeatures
description
: Prefs to control the strict ETP features
owner
: tihuang@mozilla.com
hasExposure
: false
variables
features
description
: The list of strict ETP features to enable in ETP strict mode.
type
: string
setPref
branch
: default
pref
"browser.contentblocking.features.strict"
thirdPartyCookieBlocking
description
: Prefs to control third-party cookie blocking
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabled
description
: Whether to enable third-party cookie blocking
type
: boolean
setPref
branch
: default
pref
"network.cookie.cookieBehavior.optInPartitioning"
enabledPBM
description
: Whether to enable third-party cookie blocking in private browsing mode
type
: boolean
setPref
branch
: default
pref
"network.cookie.cookieBehavior.optInPartitioning.pbmode"
thirdPartyTrackerCookieBlocking
description
: Prefs to control third-party tracker cookie blocking
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabled
description
: Whether to enable third-party tracker cookie blocking.
type
: boolean
setPref
branch
: default
pref
"network.cookie.cookieBehavior.trackerCookieBlocking"
googleSafeBrowsingV5
description
: Control Google Safe Browsing V5 protocol
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabled
description
: Whether to enable Google Safe Browsing V5 protocol.
type
: boolean
setPref
branch
: default
pref
"browser.safebrowsing.provider.google5.enabled"
safeBrowsingRealTime
description
: Control Safe Browsing real-time lookup and simulation
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabled
description
: Whether to enable Safe Browsing real-time lookup.
type
: boolean
setPref
branch
: default
pref
"browser.safebrowsing.realTime.enabled"
globalCacheEnabled
description
: Whether to enable the Global Cache for real-time lookup.
type
: boolean
setPref
branch
: default
pref
"browser.safebrowsing.globalCache.enabled"
simulationEnabled
description
: Whether to enable the real-time request simulator.
type
: boolean
setPref
branch
: default
pref
"browser.safebrowsing.realTime.simulation.enabled"
simulationCacheTTLSec
description
: Cache TTL in seconds for the real-time request simulator.
type
: int
setPref
branch
: default
pref
"browser.safebrowsing.realTime.simulation.cacheTTLSec"
simulationHitProbability
description
: >
Hit probability for the real-time request simulator, expressed as
parts per million. 1000000 = 100%, 1 = 0.0001%, 0 = never hit.
type
: int
setPref
branch
: default
pref
"browser.safebrowsing.realTime.simulation.hitProbability"
simulationNegativeCacheEnabled
description
: >
Whether to enable the negative cache for the real-time request
simulator. When enabled, prefixes with no hits are cached to skip
subsequent requests.
type
: boolean
setPref
branch
: default
pref
"browser.safebrowsing.realTime.simulation.negativeCacheEnabled"
simulationNegativeCacheTTLSec
description
: >
TTL in seconds for negative cache entries in the real-time request
simulator.
type
: int
setPref
branch
: default
pref
"browser.safebrowsing.realTime.simulation.negativeCacheTTLSec"
fxaButtonVisibility
description
: Prefs to control the visibility of the Firefox Accounts toolbar button when not signed in.
owner
: mconley@mozilla.com
hasExposure
: false
variables
boolean
description
: True if the Firefox Accounts toolbar button should be visible when not signed in.
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.toolbar.defaultVisible
pxiToolbarEnabled
description
: >-
True if we
're enabling the PXI dropdown menu for the FxA toolbar button instead of
taking the user straight to login
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.toolbar.pxiToolbarEnabled
monitorEnabled
description
: >-
Toggle the Monitor CTA
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.toolbar.pxiToolbarEnabled.monitorEnabled
relayEnabled
description
: >-
Toggle the Relay CTA
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.toolbar.pxiToolbarEnabled.relayEnabled
vpnEnabled
description
: >-
Toggle the VPN CTA
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.toolbar.pxiToolbarEnabled.vpnEnabled
avatarIconVariant
description
: >-
Controls the icon that appears in the toolbar button when in the
signed-out state.
One
of the following values:
- control
- human-circle
- fox-circle
type
: string
fxaClientAssociation
description
: Prefs to control the client association ping.
owner
: mconley@mozilla.com
hasExposure
: false
variables
pingEnabled
description
: >-
True if the client association ping should be sent.
type
: boolean
setPref
branch
: user
pref
: identity.fxaccounts.telemetry.clientAssociationPing.enabled
fxaAppMenuItem
description
: >-
Prefs to control the appearance and copy of the FxA sign-in button in the
AppMenu when signed out.
owner
: mconley@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is recorded when the user is enrolled in an experiment using this
feature and the AppMenu on Firefox Desktop is opened.
variables
ctaCopyVariant
description
: >-
One
of the following values:
- control
- sync-devices
- backup-data
- backup-sync
- mobile
type
: string
fxaAvatarMenuItem
description
: >-
Prefs to control the appearance and copy of the FxA sign-in button in the
FxA avatar menu when signed out.
owner
: mconley@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is recorded when the user is enrolled in an experiment using this
feature and the FxA avatar menu on Firefox Desktop is opened.
variables
ctaCopyVariant
description
: >-
One
of the following values:
- control
- sync-devices
- backup-data
- backup-sync
- mobile
type
: string
legacyHeartbeat
description
: Normandy Heartbeat exposed to Nimbus
owner
: beth@mozilla.com
hasExposure
: false
schema
uri
resource://normandy/schemas/LegacyHeartbeat.schema.json
path
"toolkit/components/normandy/schemas/LegacyHeartbeat.schema.json"
variables
survey
type
: json
description
: The Heartbeat survey parameters.
queryStripping
description
: Query parameter stripping anti-tracking feature.
owner
: emz@mozilla.com
hasExposure
: false
variables
enabledNormalBrowsing
type
: boolean
setPref
branch
: default
pref
: privacy.query_stripping.enabled
description
: Enables / disables URL query string stripping in normal browsing mode.
enabledPrivateBrowsing
type
: boolean
setPref
branch
: default
pref
: privacy.query_stripping.enabled.pbmode
description
: Enables / disables URL query string stripping in private browsing mode.
allowList
type
: string
setPref
branch
: default
pref
: privacy.query_stripping.allow_list
description
: >-
List of sites exempt from query stripping. This list will be merged with
records coming from RemoteSettings.
stripList
type
: string
setPref
branch
: default
pref
: privacy.query_stripping.strip_list
description
: >-
List of query params to be stripped from URIs. This list will be merged
with records coming from RemoteSettings.
fingerprintingProtection
description
: Control Fingerprinting Protection
owner
: tihuang@mozilla.com
hasExposure
: false
variables
enabledNormal
type
: boolean
setPref
branch
: default
pref
: privacy.fingerprintingProtection
description
: Enables / disables fingerprinting protection in normal browsing mode.
enabledPrivate
type
: boolean
setPref
branch
: default
pref
: privacy.fingerprintingProtection.pbmode
description
: Enables / disables fingerprinting protection in private browsing mode.
overrides
type
: string
setPref
branch
: default
pref
: privacy.fingerprintingProtection.overrides
description
: >-
The protection overrides to add or remove fingerprinting protection
targets. Please check RFPTargets.inc for all supported targets.
fdlibm_math
type
: boolean
setPref
branch
: default
pref
: javascript.options.use_fdlibm_for_sin_cos_tan
description
: >-
Uses a different math backend for Math.sin/cos/tan in JavaScript that exposes less entropy
canvas_random_use_siphash
type
: boolean
setPref
branch
: default
pref
: privacy.resistFingerprinting.randomization.canvas.use_siphash
description
: >-
Uses the SipHash function for canvas randomization.
enabledBaseline
type
: boolean
setPref
branch
: default
pref
: privacy.baselineFingerprintingProtection
description
: Enables / disables baseline fingerprinting protection.
overridesBaseline
type
: string
setPref
branch
: default
pref
: privacy.baselineFingerprintingProtection.overrides
description
: >-
The protection overrides to add or remove fingerprinting protection
targets. Please check RFPTargets.inc for all supported targets.
userCharacteristics
description
: Control user characteristic data collection
owner
: tihuang@mozilla.com
hasExposure
: false
variables
currentVersion
type
: int
setPref
branch
: user
pref
: toolkit.telemetry.user_characteristics_ping.current_version
description
: The current collection version of the user characteristics.
migrationWizard
description
: Prefs to control the Migration Wizard UI.
owner
: mconley@mozilla.com
hasExposure
: false
variables
showImportAll
description
: True if the
"Variant 2"
of the Migration Wizard browser / profile selection UI should be used. This is only meaningful in the new Migration Wizard.
type
: boolean
setPref
branch
: user
pref
: browser.migrate.content-modal.import-all.enabled
showPreferencesEntrypoint
description
: True if an entrypoint to the migration wizard should be visible in about:preferences.
type
: boolean
setPref
branch
: user
pref
: browser.migrate.preferences-entrypoint.enabled
aboutWelcomeBehavior
description
: >-
When migration is kicked off from about:welcome, there are
a few different behaviors that we want to test, controlled
by a preference that is instrumented for Nimbus. The pref
has
the following possible states:
"autoclose"
The user will be directed to the migration wizard in
about:preferences, but once the wizard is dismissed,
the tab will close.
"embedded"
The migration wizard is embedded in about:welcome.
"standalone"
The migration wizard will open in a new top-level content
window.
"default"
/ other
The user will be directed to the migration wizard in
about:preferences. The tab will not close once the
user closes the wizard.
type
: string
setPref
branch
: user
pref
: browser.migrate.content-modal.about-welcome-behavior
migrateExtensions
description
: True if importing extensions is enabled.
type
: boolean
setPref
branch
: user
pref
: browser.migrate.chrome.extensions.enabled
chromeCanRequestPermissions
description
: >-
True if Chrome-based browsers can request read permissions on
platforms where the browser is restricted from reading the contents
of a Chrome-based browser
's user data directory. In practice, this
is only relevant to the Linux platform when the browser is installed
as a Snap package.
type
: boolean
setPref
branch
: user
pref
: browser.migrate.chrome.get_permissions.enabled
mixedContentUpgrading
description
: Prefs to control whether we upgrade mixed passive content (images, audio, video) from http to https
owner
: fbraun@mozilla.com
hasExposure
: false
variables
enabled
description
: True if the mixed content upgrading pref is enabled
type
: boolean
setPref
branch
: default
pref
: security.mixed_content.upgrade_display_content
unexpectedScriptLoadNotificationBar
description
: Pref to control whether we show the Unexpected Script Load Notification Bar
owner
: tritter@mozilla.com
hasExposure
: false
variables
enabled
description
: True if we want to disable the notification bar
type
: boolean
setPref
branch
: default
pref
: security.hide_parent_unrestricted_js_loads_warning.temporary
gc
description
: Prefs that control gc heuristics.
owner
: dpalmeiro@mozilla.com
hasExposure
: false
variables
max_nursery_size
description
: Set the maximum size of the GC nursery, in kb.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery.max_kb"
min_nursery_size
description
: Set the minimum size of the GC nursery, in kb.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery.min_kb"
gc_allocation_threshold_mb
description
: Lower limit for collecting a zone, in MB.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_allocation_threshold_mb"
gc_balanced_heap_limits
description
: Whether balanced heap limits are enabled.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_balanced_heap_limits"
gc_compacting
description
: Whether compacting GC is enabled.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_compacting"
gc_generational
description
: Whether generational GC is enabled.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_generational"
gc_heap_growth_factor
description
: Heap growth parameter for balanced heap limit calculation.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_heap_growth_factor"
gc_helper_thread_ratio
description
: Number of threads to use for parallel GC work.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_helper_thread_ratio"
gc_high_frequency_large_heap_growth
description
: Heap growth factor for large heaps in the high-frequency GC state.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_high_frequency_large_heap_growth"
gc_high_frequency_small_heap_growth
description
: Heap growth factor for small heaps in the high-frequency GC state.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_high_frequency_small_heap_growth"
gc_high_frequency_time_limit_ms
description
: GCs less than this far apart in milliseconds will be
considered high-frequency GCs.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_high_frequency_time_limit_ms"
gc_incremental
description
: Whether incremental GC is enabled. If not, GC will always run to completion.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_incremental"
incremental_weakmap
description
: Enable incremental weakmap marking.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.incremental_weakmap"
gc_incremental_slice_ms
description
: Max milliseconds to spend in an incremental GC slice.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_incremental_slice_ms"
gc_large_heap_incremental_limit
description
: Limit of how far over the incremental trigger threshold we allow the
heap to grow before finishing a collection non-incrementally, for large heaps.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_large_heap_incremental_limit"
gc_large_heap_size_min_mb
description
: Lower limit for classifying a heap as large, in MB.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_large_heap_size_min_mb"
gc_low_frequency_heap_growth
description
: Heap growth factor for low frequency GCs.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_low_frequency_heap_growth"
gc_malloc_threshold_base_mb
description
: Set the malloc threshold base value in MB.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_malloc_threshold_base_mb"
gc_max_empty_chunk_count
description
: Do not keep more than this many unused chunks in the free chunk pool.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_max_empty_chunk_count"
gc_max_helper_threads
description
: The maximum number of background threads to use for parallel GC work.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_max_helper_threads"
gc_min_empty_chunk_count
description
: We try to keep at least this many unused chunks in the free chunk
pool at all times, even after a shrinking GC.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_min_empty_chunk_count"
gc_parallel_marking
description
: Enable parallel marking.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_parallel_marking"
gc_parallel_marking_threshold_mb
description
: The heap size above which to use parallel marking.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_parallel_marking_threshold_mb"
gc_max_parallel_marking_threads
description
: The maximum number of threads to use for parallel marking, if enabled.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_max_parallel_marking_threads"
gc_per_zone
description
: Whether per-zone GC is enabled. If not, all zones are collected every time.
type
: boolean
setPref
branch
: user
pref
"javascript.options.mem.gc_per_zone"
gc_small_heap_incremental_limit
description
: Limit of how far over the incremental trigger threshold we allow the heap
to grow before finishing a collection non-incrementally, for small heaps.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_small_heap_incremental_limit"
gc_small_heap_size_max_mb
description
: Upper limit for classifying a heap as small, in MB.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_small_heap_size_max_mb"
gc_urgent_threshold_mb
description
: Set the urgent threshold, in MB.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.gc_urgent_threshold_mb"
nursery_eager_collection_threshold_kb
description
: Set the eager collection threshold, in kb, for the nursery.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery_eager_collection_threshold_kb"
nursery_eager_collection_threshold_percent
description
: Set the eager collection percent threshold for the nursery.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery_eager_collection_threshold_percent"
nursery_eager_collection_timeout_ms
description
: Set the eager collection timeout, in ms, for the nursery.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery_eager_collection_timeout_ms"
nursery_max_time_goal_ms
description
: Set the nursery
's maximum time goal, in ms.
type
: int
setPref
branch
: user
pref
"javascript.options.mem.nursery_max_time_goal_ms"
jsParallelParsing
description
: Pref to toggle JS parallel parsing.
owner
: dpalmeiro@mozilla.com, nbp@mozilla.com
hasExposure
: false
variables
enabled
description
: True to enable parallel parsing.
type
: boolean
setPref
branch
: user
pref
"javascript.options.parallel_parsing"
jitThresholds
description
: Prefs that control jit tier thresholds.
owner
: dpalmeiro@mozilla.com, jdemooij@mozilla.com
hasExposure
: false
variables
blinterp_threshold
description
: Set the threshold to enable blinterp compilation.
type
: int
setPref
branch
: user
pref
"javascript.options.blinterp.threshold"
baseline_threshold
description
: Set the threshold to enable baseline compilation.
type
: int
setPref
branch
: user
pref
"javascript.options.baselinejit.threshold"
ion_threshold
description
: Set the threshold to enable ion compilation.
type
: int
setPref
branch
: user
pref
"javascript.options.ion.threshold"
ion_bailout_threshold
description
: Set the ion frequent bailout threshold.
type
: int
setPref
branch
: user
pref
"javascript.options.ion.frequent_bailout_threshold"
ion_offthread_compilation
description
: True to enable offthread ion compilations.
type
: boolean
setPref
branch
: user
pref
"javascript.options.ion.offthread_compilation"
inlining_max_length
description
: Set the max bytecode length considered for inlining.
type
: int
setPref
branch
: user
pref
"javascript.options.inlining_bytecode_max_length"
jitHintsCache
description
: Pref to toggle the JIT hints cache.
owner
: dpalmeiro@mozilla.com
hasExposure
: false
variables
enabled
description
: True to enable the hints cache.
type
: boolean
setPref
branch
: user
pref
"javascript.options.jithints"
scriptloader
description
: Prefs that control scriptloader heuristics.
owner
: dpalmeiro@mozilla.com
hasExposure
: false
variables
bytecode_cache_strategy
description
: Set the bytecode cache strategy.
type
: int
setPref
branch
: user
pref
"dom.script_loader.bytecode_cache.strategy"
delazification_strategy
description
: Controls when functions are parsed. 0=on-demand (lazy), 255=eager parse all.
type
: int
setPref
branch
: user
pref
"dom.script_loader.delazification.strategy"
delazification_max_size
description
: Maximum number of bytes supported for speculate OMT full parsing.
type
: int
setPref
branch
: user
pref
"dom.script_loader.delazification.max_size"
delazification_min_mem
description
: Minimum memory required, in GB, to enable OMT full parsing.
type
: int
setPref
branch
: user
pref
"dom.script_loader.delazification.min_mem"
speculate_async_enabled
description
: Enable speculative OMT parsing for async scripts.
type
: boolean
setPref
branch
: user
pref
"dom.script_loader.external_scripts.speculate_async.enabled"
speculate_link_preload_enabled
description
: Enable speculative OMT parsing for link=preload scripts.
type
: boolean
setPref
branch
: user
pref
"dom.script_loader.external_scripts.speculate_link_preload.enabled"
speculate_non_parser_inserted_enabled
description
: Enable speculative OMT parsing for non parser inserted scripts.
type
: boolean
setPref
branch
: user
pref
"dom.script_loader.external_scripts.speculate_non_parser_inserted.enabled"
speculate_enabled
description
: Enable speculative OMT parsing.
type
: boolean
setPref
branch
: user
pref
"dom.script_loader.external_scripts.speculative_omt_parse.enabled"
navigation_cache_enabled
description
: Enable the navigation cache.
type
: boolean
setPref
branch
: user
pref
"dom.script_loader.experimental.navigation_cache"
opaqueResponseBlocking
description
: Prefs to enable Opaque Response Blocking
owner
: farre@mozilla.com
hasExposure
: true
exposureDescription
: Exposure is sent when a response is blocked
variables
enabled
description
: Whether ORB is enabled
type
: boolean
setPref
branch
: user
pref
"browser.opaqueResponseBlocking"
javascriptValidator
description
: Whether JavaScript validation for ORB is enabled
type
: boolean
setPref
branch
: user
pref
"browser.opaqueResponseBlocking.javascriptValidator"
filterFetchResponse
description
: Whether filtering of internal responses in the parent ORB is enabled
type
: int
setPref
branch
: user
pref
"browser.opaqueResponseBlocking.filterFetchResponse"
mediaExceptionsStrategy
description
: >-
If we partially or wholly allow audio and video MIME types in conflict with spec.
type
: int
setPref
branch
: user
pref
"browser.opaqueResponseBlocking.mediaExceptionsStrategy"
updatePrompt
description
: Prefs to control content and behavior of update notifications
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent at most once per browsing session when an update
notification prompt is displayed.
variables
showReleaseNotesLink
type
: boolean
description
: >-
If true, the
"Learn More"
link will be shown in the update prompt. If
false or omitted, the link will only be shown for supported locales.
releaseNotesURL
type
: string
fallbackPref
: app.releaseNotesURL.prompt
description
: >-
Template for the URL opened when the user clicks the
"Learn More"
link
in the update prompt. If an empty string, the link will not be shown.
powerSaver
description
: Prefs to control power saving behaviors
owner
: florian@mozilla.com
hasExposure
: false
variables
reduceFrameRates
type
: int
setPref
branch
: user
pref
"gfx.display.max-frame-rate"
description
: >-
Limit the number of frames displayed per second.
If omitted, the refresh rate of the screen will be used.
mediaAutoPlay
type
: int
setPref
branch
: user
pref
"media.autoplay.default"
description
: >-
Control if media is allowed to auto-play, with and without sound.
backgroundTimerMinTime
type
: int
setPref
branch
: user
pref
"dom.min_background_timeout_value"
description
: >-
Limit how frequently timers are allowed to run in background tabs.
backgroundTimerRegenerationRate
type
: int
setPref
branch
: user
pref
"dom.timeout.background_budget_regeneration_rate"
description
: >-
Limit how quickly the background tab timer budget regenerates.
backgroundUpdate
description
: Prefs to control aspects of the background update process.
owner
: install-update@mozilla.com
hasExposure
: true
exposureDescription
: >-
The exposure event is sent when scheduling the background task and both the
feature is enabled and the service registry key (Mozilla Maintenance
Service) is *not* available for this installation. That is the first time
the feature can impact Firefox behaviour and the user experience.
variables
enableUpdatesForUnelevatedInstallations
description
: >-
Allow the background update process to download and apply updates when
the Mozilla Maintenance Service is unavailable but the installation
directory can be written.
type
: boolean
setPref
branch
: user
pref
: app.update.background.allowUpdatesForUnelevatedInstallations
bookmarks
description
: Prefs to control aspects of the bookmarks system.
owner
: omc-core@mozilla.com
hasExposure
: false
variables
enableBookmarksToolbar
type
: string
setPref
branch
: user
pref
: browser.toolbars.bookmarks.visibility
description
: If the bookmarks toolbar should never, always, or only show on newtab.
showOtherBookmarks
type
: boolean
setPref
branch
: user
pref
: browser.toolbars.bookmarks.showOtherBookmarks
description
: Display state of the
"Other Bookmarks"
toolbar button.
cookieBannerHandling
description
: Automatically handle cookie banners on the user
's behalf.
owner
: emz@mozilla.com
hasExposure
: false
variables
modeNormalBrowsing
type
: int
setPref
branch
: default
pref
: cookiebanners.service.mode
description
: >-
Controls the cookie banner handling mode in normal browsing.
Values
: 0 - disabled, 1 - reject all, 2 - reject all with accept all fallback.
modePrivateBrowsing
type
: int
setPref
branch
: default
pref
: cookiebanners.service.mode.privateBrowsing
description
: >-
Controls the cookie banner handling mode in private browsing.
Values
: 0 - disabled, 1 - reject all, 2 - reject all with accept all fallback.
enableGlobalRules
type
: boolean
setPref
branch
: default
pref
: cookiebanners.service.enableGlobalRules
description
: >-
Enables use of global CookieBannerRules, which apply to all sites.
This enables handling of CMPs across sites without the use of site-specific rules.
enableGlobalRulesSubFrames
type
: boolean
setPref
branch
: default
pref
: cookiebanners.service.enableGlobalRules.subFrames
description
: >-
Whether global rules are allowed to run in sub-frames. Running query
selectors in every sub-frame may negatively impact performance, but is
required for some CMPs.
enableDetectOnly
type
: boolean
setPref
branch
: default
pref
: cookiebanners.service.detectOnly
description
: >-
When set to true, cookie banners are detected and detection events are
dispatched, but they will not be handled.
This pref applies to both normal and private browsing windows.
enablePromo
type
: boolean
setPref
branch
: default
pref
: browser.promo.cookiebanners.enabled
description
: Enables the cookie banner promo in about:privatebrowsing.
enableDesktopFeatureCallout
type
: boolean
setPref
branch
: default
pref
: cookiebanners.ui.desktop.showCallout
description
: Enables the cookie banner feature callout on desktop.
backgroundThreads
description
: Prefs to control MacOS thread priorities for power savings.
owner
: kwright@mozilla.com
hasExposure
: false
variables
use_low_power
description
: >-
Use the MacOS QoS libraries to deprioritize select threads.
type
: boolean
setPref
branch
: user
pref
: threads.use_low_power.enabled
lower_mainthread_priority_in_background
description
: >-
When a browsing context is put in the background and isn
't actively playing
media, deprioritize its main thread.
type
: boolean
setPref
branch
: user
pref
: threads.lower_mainthread_priority_in_background.enabled
reportBrokenSite
description
: The Report Broken Site feature
owner
: twisniewski@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: ui.new-webcompat-reporter.enabled
description
: >-
Whether Report Broken Site is enabled
sendMoreInfo
type
: boolean
setPref
branch
: user
pref
: ui.new-webcompat-reporter.send-more-info-link
description
: >-
Whether Report Broken Site shows the send more info link directing
users to webcompat.com (defaults to true for prerelease channels)
reasonDropdown
type
: int
setPref
branch
: user
pref
: ui.new-webcompat-reporter.reason-dropdown
description
: >-
0 = do not show the
"reason"
dropdown
1 = show an optional
"reason"
dropdown
2 = show a required
"reason"
dropdown
feltPrivacy
description
: Prefs for Felt Privacy v1 experiments
owner
: cmeador@mozilla.com
hasExposure
: true
exposureDescription
: Exposure when user opens a private browsing window.
variables
feltPrivacy
type
: boolean
setPref
branch
: default
pref
: browser.privatebrowsing.felt-privacy-v1
description
: >-
When true, new styles and copy enabled on about:privatebrowsing. When true,
a toggle for showing or hiding quick suggestions appears in about:preferences.
resetPBMAction
type
: boolean
setPref
branch
: default
pref
: browser.privatebrowsing.resetPBM.enabled
description
: >-
Enables the reset PBM feature button and confirmation panel.
phc
description
: Prefs to control the Probabalistic Heap Checker (PHC)
owner
: pbone@mozilla.com
hasExposure
: false
variables
phcEnabled
description
: Whether to enable PHC
type
: boolean
setPref
branch
: user
pref
: memory.phc.enabled
phcMinRamMB
description
: The minimum amount of RAM required to enable PHC
type
: int
setPref
branch
: user
pref
: memory.phc.min_ram_mb
phcAvgDelayFirst
description
: The delay before the first PHC allocation in the parent process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.first
phcAvgDelayNormal
description
: The delay between PHC allocations in the parent process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.normal
phcAvgDelayPageReuse
description
: The delay before reusing a PHC page in the parent process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.page_reuse
phcAvgDelayContentFirst
description
: The delay before the first PHC allocation in the content process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.content.first
phcAvgDelayContentNormal
description
: The delay between PHC allocations in the content process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.content.normal
phcAvgDelayContentPageReuse
description
: The delay before reusing a PHC page in the content process
type
: int
setPref
branch
: user
pref
: memory.phc.avg_delay.content.page_reuse
phcMaxSize
description
: The maximum amount of memory used for the PHC
type
: int
setPref
branch
: user
pref
: memory.phc.size_kb
mailto
description
: Prefs to control aspects of the mailto handler
owner
: install-update@mozilla.com
hasExposure
: true
exposureDescription
: >-
The exposure event is sent when a webmail site calls the
registerProtocolHandler function and when users use mailto links in Firefox.
variables
dualPrompt
type
: boolean
description
: >-
Can be used to toggle the entire feature on and off.
fallbackPref
: browser.mailto.dualPrompt
dualPrompt.onLocationChange
type
: boolean
description
: >-
Display a reminder prompt for known webmailers if the prompt was not
dismissed before the next visit of that webmailer.
fallbackPref
: browser.mailto.dualPrompt.onLocationChange
dualPrompt.dismissXClickMinutes
type
: int
description
: >-
This pref controls after how many minutes the mailto prompt can be shown
again, which has been dismissed by clicking the
'X'
button before.
fallbackPref
: browser.mailto.dualPrompt.dismissXClickMinutes
dualPrompt.dismissNotNowMinutes
type
: int
description
: >-
This pref controls after how many minutes the mailto prompt can be shown
again, which has been dismissed by clicking a
'not now'
button on it.
fallbackPref
: browser.mailto.dualPrompt.dismissNotNowMinutes
nimbusIsReady
description
: A feature that provides the number of Nimbus is_ready events to send
when Nimbus is ready.
owner
: chumphreys@mozilla.com
hasExposure
: false
applications
- firefox-desktop
variables
eventCount
description
: The number of events that should be sent.
type
: int
nimbusTelemetry
description
: A feature that enables or disables Nimbus telemetry.
owner
: nimbus-team@mozilla.com
hasExposure
: false
applications
- firefox-desktop
- firefox-desktop-background-task
variables
gleanMetricConfiguration
description
: >
A Glean metric configuration JSON blob.
This
is limited to configuring the following categories:
- nimbus_events
- nimbus_targeting_context
- nimbus_targeting_environment
type
: json
nimbusTargetingEnvironment
description
: >
Configuration for the nimbus_targeting_environment telemetry category.
type
: json
schema
uri
: resource://nimbus/schemas/NimbusTelemetryFeature.schema.json
path
: toolkit/components/nimbus/schemas/NimbusTelemetryFeature.schema.json
httpsFirst
description
: >-
Prefs for HTTPS-First, which upgrades all top-level page loads to HTTPS and
provides a automatic fallback to HTTP if the site isn
't available via HTTPS.
owner
: mjurgens@mozilla.com, seceng-telemetry@mozilla.com
hasExposure
: false
variables
enabled
description
: Enable HTTPS-First
type
: boolean
setPref
branch
: default
pref
: dom.security.https_first
enabledPbm
description
: Enable HTTPS-First in private browsing only
type
: boolean
setPref
branch
: default
pref
: dom.security.https_first_pbm
enabledSchemeless
description
: >-
Enables schemeless HTTPS-First, which will only apply HTTPS-First to address
bar inputs without a scheme. This essentially makes HTTPS the default
scheme in the address bar, while providing a fallback to HTTP.
type
: boolean
setPref
branch
: default
pref
: dom.security.https_first_schemeless
backgroundTimerMs
description
: >-
After a request gets upgraded to HTTPS, specifies the time after which a
second HTTP request is fired to check if the site is available via
HTTPS, but timing out via HTTPS. This also applies to HTTPS-Only, not
just HTTPS-First.
type
: int
setPref
branch
: default
pref
: dom.security.https_only_fire_http_request_background_timer_ms
contentRelevancy
description
: >-
A feature for interest-based content relevance ranking and personalization
for Firefox.
owner
: disco-team@mozilla.com
hasExposure
: false
variables
enabled
description
: Enable this feature
type
: boolean
fallbackPref
: toolkit.contentRelevancy.enabled
maxInputUrls
description
: The maximum number of input URLs for interest classification
type
: int
minInputUrls
description
: The minimal number of input URLs for interest classification
type
: int
timerInterval
description
: >-
The interval (in seconds) of the background update timer for the content
relevancy manager
type
: int
setPref
branch
: user
pref
: toolkit.contentRelevancy.timerInterval
ingestEnabled
description
: Enable the ingestion through the Rust component
type
: boolean
fallbackPref
: toolkit.contentRelevancy.ingestEnabled
backupService
description
: Prefs to control the profile backup service
owner
: mconley@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: browser.backup.enabled
description
: >-
When true, the profile backup service will be initialized soon after
startup.
sqlitePagesPerStep
description
: >-
The number of database pages to backup per step when backing up an
SQLite database.
type
: int
setPref
branch
: user
pref
: browser.backup.sqlite.pages_per_step
sqliteStepDelayMs
description
: >-
The delay between SQLite database backup steps in milliseconds.
type
: int
setPref
branch
: user
pref
: browser.backup.sqlite.step_delay_ms
idleThresholdSeconds
description
: >-
The number of seconds of user idle time to wait for before considering
to schedule a backup.
type
: int
setPref
branch
: user
pref
: browser.backup.scheduled.idle-threshold-seconds
minTimeBetweenBackupsSeconds
description
: >-
The minimum number of seconds since the last known backup that must
pass before we might schedule a backup.
type
: int
setPref
branch
: user
pref
: browser.backup.scheduled.minimum-time-between-backups-seconds
archiveKillswitch
type
: boolean
description
: >-
Disables backup archiving, overrides all other configs when true.
restoreKillswitch
type
: boolean
description
: >-
Disables backup restoration, overrides all other configs when true.
pqcrypto
description
: Prefs that control the use of post-quantum cryptography.
owner
: jschanck@mozilla.com
hasExposure
: false
variables
tlsEnableMlkem
type
: boolean
setPref
branch
: default
pref
: security.tls.enable_kyber
description
: >-
Whether to enable mlkem768x25519 for TLS.
h3EnableMlkem
type
: boolean
setPref
branch
: default
pref
: network.http.http3.enable_kyber
description
: >-
Whether to enable mlkem768x25519 for H3/QUIC.
sendP256
type
: boolean
setPref
branch
: default
pref
: security.tls.client_hello.send_p256_keyshare
description
: >-
Whether to send a P256 share in the client hello in QUIC and TLS.
dtlsWebRTCEnableMlkem
type
: boolean
setPref
branch
: default
pref
: media.webrtc.enable_pq_hybrid_kex
description
: >-
Whether to enable mlkem768x25519 for DTLS in WebRTC.
dtlsWebRTC
description
: Pref that controls the use of DTLS.
owner
: nkulatova@mozilla.com
hasExposure
: false
variables
tlsVersionDTLS
type
: int
setPref
branch
: default
pref
: media.peerconnection.dtls.version.max
description
: >-
The maximum version of DTLS protocol used in WebRTC (770 = DTLS 1.0, 771 = DTLS 1.2, 772 = DTLS 1.3).
certCompression
description
: Prefs that control the use of certificate compression decoders.
owner
: anna.weine@mozilla.com
hasExposure
: false
variables
tlsEnableZlib
type
: boolean
setPref
branch
: default
pref
: security.tls.enable_certificate_compression_zlib
description
: >-
Whether to enable Zlib for TLS certificate compression.
h3EnableZlib
type
: boolean
setPref
branch
: default
pref
: network.http.http3.enable_certificate_compression_zlib
description
: >-
Whether to enable Zlib for H3/QUIC certificate compression.
tlsEnableBrotli
type
: boolean
setPref
branch
: default
pref
: security.tls.enable_certificate_compression_brotli
description
: >-
Whether to enable Brotli for TLS certificate compression.
h3EnableBrotli
type
: boolean
setPref
branch
: default
pref
: network.http.http3.enable_certificate_compression_brotli
description
: >-
Whether to enable Brotli for H3/QUIC certificate compression.
tlsEnableZstd
type
: boolean
setPref
branch
: default
pref
: security.tls.enable_certificate_compression_zstd
description
: >-
Whether to enable Zstd for TLS certificate compression.
h3EnableZstd
type
: boolean
setPref
branch
: default
pref
: network.http.http3.enable_certificate_compression_zstd
description
: >-
Whether to enable Zstd for H3/QUIC certificate compression.
bounceTrackingProtection
description
: Controls the Bounce Tracking Protection feature.
owner
: emz@mozilla.com
isEarlyStartup
: true
hasExposure
: true
exposureDescription
: >-
Exposure is recored after every purge run which purged at least one tracker.
Exposure is only recorded when the feature is fully enabled and not in
dry-run mode.
variables
mode
type
: int
setPref
branch
: default
pref
: privacy.bounceTrackingProtection.mode
description
: >-
Mode to run the feature in. See nsIBounceTrackingProtection.idl for
documentation.
requireStatefulBounces
type
: boolean
setPref
branch
: default
pref
: privacy.bounceTrackingProtection.requireStatefulBounces
description
: >-
If true, only bounce redirects where the middle hop/s access cookies or
storage will be considered to be bounce trackers. If false, all
redirects that fit the bounce tracker heuristic will be considered.
remoteTabManagement
description
: >
Features that let users manage tabs on other devices that are
connected to the same Mozilla account.
owner
: skhamis@mozilla.com
hasExposure
: false
variables
closeTabsEnabled
description
: >-
When true, the user can close tabs on other devices connected to
the same Mozilla account from the synced tabs menu.
type
: boolean
fallbackPref
: identity.fxaccounts.commands.remoteTabManagement.enabled
crlite
description
: Prefs that control the use of CRLite
owner
: jschanck@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: security.remote_settings.crlite_filters.enabled
description
: >-
Whether CRLite artifacts will be downloaded.
channel
type
: string
setPref
branch
: default
pref
: security.pki.crlite_channel
description
: >-
The channel from which CRLite artifacts will be downloaded.
mode
type
: int
setPref
branch
: default
pref
: security.pki.crlite_mode
description
: >-
How CRLite results will be interpreted.
timestamps_for_coverage
type
: int
setPref
branch
: default
pref
: security.pki.crlite_timestamps_for_coverage
description
: >-
How many covered timestamps do we need to see before we enforce a CRLite result.
chatbot
description
: AI chatbot feature configuration
owner
: elee@mozilla.com
hasExposure
: false
variables
badgeSidebar
type
: boolean
description
: Show badge on chatbot sidebar tool on enrollment
minVersion
type
: string
description
: Minimum Firefox version to apply prefs
prefs
type
: json
description
: >-
The prefs to set under browser.ml.chat.* with object keys as the
sub-pref and values objects indicating the desired branch and value
defaulting to clearing the user branch value.
linkPreviews
description
: Enabling the link previews feature
owner
: elee@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.ml.linkPreview.enabled
description
: If true, will show previews when over link and keyboard shortcut is pressed
prefs
type
: json
description
: >-
The prefs to set under browser.ml.linkPreview.* with object keys as the
sub-pref and values objects indicating the desired branch and value
defaulting to clearing the user branch value.
sidebar
description
: Sidebar feature configuration
owner
: elee@mozilla.com
hasExposure
: false
variables
minVersion
type
: string
description
: Minimum Firefox version to apply prefs
revamp
type
: boolean
description
: sidebar.revamp pref value to set on user branch; true for new experience
verticalTabs
type
: boolean
description
: sidebar.verticalTabs pref value to set on user branch; true to enable vertical tabs
visibility
type
: string
description
: sidebar.visibility pref value (
"hide"
or
"always-show"
) to set on user branch
fxms_bmb_button
description
: A feature for the Firefox Messaging System Bookmarks Bar button surface
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is sent if the message is about to be shown after trigger and
targeting conditions on the message matched.
schema
uri
: chrome://browser/content/asrouter/schemas/MessagingExperiment.schema.json
path
: browser/components/asrouter/content-src/schemas/MessagingExperiment.schema.json
variables
: {}
contentProcessSandbox
description
: Prefs that control the content process sandbox.
owner
: bowen@mozilla.com
hasExposure
: false
variables
Level
description
: Content process sandbox level
type
: int
setPref
branch
: user
pref
: security.sandbox.content.level
certificateTransparency
description
: Certificate Transparency configuration
owner
: dkeeler@mozilla.com
hasExposure
: false
variables
mode
type
: int
setPref
branch
: default
pref
: security.pki.certificate_transparency.mode
description
: >-
What mode Certificate Transparency is in (0=disable, 1=telemetry only,
2=enforce).
setToDefaultPrompt
description
"Experimental set to default spotlight"
owner
: omc-core@mozilla.com
hasExposure
: true
exposureDescription
: >-
"Exposure is sent if the message is about to be shown after trigger and targeting conditions on the message matched."
variables
showSpotlightPrompt
description
: Show experimental set to default spotlight message instead of default prompt
type
: boolean
message
description
: Message to show instead of the default prompt
type
: json
tabNotes
description
: >-
Associate short text notes with specific web pages and surface those notes later
when the user returns to that web page in a tab.
owner
: sthompson@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: >-
Controls whether tab notes storage, code, and UI elements are turned on.
setPref
branch
: default
pref
: browser.tabs.notes.enabled
tabGroups
description
: Prefs to control Tab Groups
owner
: dao@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.tabs.groups.enabled
description
: Controls whether users can create new tab groups via drag and drop or the tab context menu
smartTabGroups
description
: Prefs to control Smart Tab Groups
owner
: rrando@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.tabs.groups.smart.enabled
description
: Controls whether users can use ml features for suggesting tab group names or similar tabs
suggestOtherTabsMethod
type
: string
setPref
branch
: user
pref
: browser.tabs.groups.smart.suggestOtherTabsMethod
description
: Controls clustering method used to suggest similar tabs feature
topicModelRevision
type
: string
setPref
branch
: user
pref
: browser.tabs.groups.smart.topicModelRevision
description
: Controls topic model version used by the feature
embeddingModelRevision
type
: string
setPref
branch
: user
pref
: browser.tabs.groups.smart.embeddingModelRevision
description
: Controls embedding model version used by the feature
nearestNeighborThresholdInt
type
: int
setPref
branch
: user
pref
: browser.tabs.groups.smart.nearestNeighborThresholdInt
description
: Controls the threshold, less than or equal to 1000, for the nearest neighbor cluster method
searchTopicEnabled
type
: boolean
setPref
branch
: user
pref
: browser.tabs.groups.smart.searchTopicEnabled
description
: For single tab groupings, use the search query as the topic rather than use ML
externalLinkHandling
description
: Controls how externally-opened URLs will be handled by Firefox.
owner
: sthompson@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure is recorded when a user clicks on a link outside of Firefox and
that link is opened by Firefox.
variables
openBehavior
description
: >-
Control how external links from another application should be opened in Firefox.
See the nsIBrowserDOMWindow `OPEN_*` constants for what the values can do.
The default value for the backing pref is `-1`. When that pref has the default
value, the code will fall back to the value of the general pref that handles
opening links, i.e. `browser.link.open_newwindow`, which defaults to `3`.
type
: int
enum
- -1
# use default browser behavior
- 2
# `OPEN_NEWWINDOW` open external links in a new window
- 3
# `OPEN_NEWTAB` open in a new tab in the topmost window at the end of the tab strip
- 6
# `OPEN_NEWTAB_FOREGROUND` open in a new tab in the topmost window at the end of the tab strip and select it
- 7
# `OPEN_NEWTAB_AFTER_CURRENT` open in a new tab in the topmost window next to the active tab
fallbackPref
: browser.link.open_newwindow.override.external
smartblockEmbeds
description
: Pref to control Smartblock Embeds
owner
: emz@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: extensions.webcompat.smartblockEmbeds.enabled
description
: >-
Controls whether smartblock embed placeholders and protections panel toggles will be shown to the user.
selectableProfiles
description
"Multiple profile management using selectableProfileService"
owner
: jhirsch@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Enables the multiple profiles feature when true. Turning off this variable will not disable the feature.
storageAccessHeuristics
description
: Heuristics that grant cookie access automatically for foreign resources
owner
: bvandersloot@mozilla.com
hasExposure
: false
variables
popup_past_interaction
type
: boolean
setPref
branch
: default
pref
: privacy.restrict3rdpartystorage.heuristic.window_open
description
: >-
Do we grant cookie access to a third party when it is opened in a popup if it has
been interacted with in the recent past?
popup_interaction
type
: boolean
setPref
branch
: default
pref
: privacy.restrict3rdpartystorage.heuristic.opened_window_after_interaction
description
: >-
Do we grant cookie access to a third party when it is opened in a popup if it has
the opener relationship and the user interacts with the popup?
type
: boolean
setPref
branch
: default
pref
: privacy.restrict3rdpartystorage.heuristic.navigation
description
: >-
Do we grant cookie access to a third party when it is interacted with earlier in this
tab
's history, and the current first party is even further back in the history?
redirect
type
: boolean
setPref
branch
: default
pref
: privacy.restrict3rdpartystorage.heuristic.recently_visited
description
: >-
Do we grant cookie access to a third party when it has been interacted with in the recent
past, has been visited in the past few minutes, and redirects itself to another top level
site?
redirect_tracker
type
: boolean
setPref
branch
: default
pref
: privacy.restrict3rdpartystorage.heuristic.redirect
description
: >-
Do we grant cookie access to a tracker third party when it has been interacted with in the
recent past and redirects itself to another top level site?
partitioned-cookie-attribute
description
: Control the enablment and migration of cookies to the Partitioned attribute, rather than TCP
owner
: bvandersloot@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: network.cookie.CHIPS.enabled
description
: >-
Do we respect the Partitioned attribute?
chipsMigrationTarget
description
: What CHIPS migration count target the browser should reach.
type
: int
setPref
branch
: default
pref
: network.cookie.CHIPS.migrateDatabaseTarget
chipsPartitionLimitEnabled
description
: Whether we enforce CHIPS partition limit
type
: boolean
setPref
branch
: default
pref
"network.cookie.chips.partitionLimitEnabled"
chipsPartitionLimitDryRun
description
: Whether we actually perform purging/rejection, used to report telemetry without webcompat issues
type
: boolean
setPref
branch
: default
pref
"network.cookie.chips.partitionLimitDryRun"
chipsPartitionLimitByteCapacity
description
: The actual value of the CHIPS partition limit in bytes
type
: boolean
setPref
branch
: default
pref
"network.cookie.chips.partitionLimitByteCapacity"
chipsAffectsTCP
description
: Whether CHIPS cookies also appear as TCP cookies when both jars are queried
type
: boolean
setPref
branch
: default
pref
"network.cookie.CHIPS.affectsTCP"
auto-pip
description
"Automatic Picture-in-Picture"
owner
: mconley@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether or not to auto-open PiP when switching tabs.
setPref
branch
: user
pref
"media.videocontrols.picture-in-picture.enable-when-switching-tabs.enabled"
urlbar-ime-search
description
"Urlbar IME"
owner
: search-and-suggest-program@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether or not to keep the urlbar panel open during IME composition.
setPref
branch
: user
pref
"browser.urlbar.keepPanelOpenDuringImeComposition"
web-rtc-global-mute-toggles
description
"WebRTC Global Mute Toggles"
owner
: mconley@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether or not to enable global mute toggles to the WebRTC indicator.
setPref
branch
: user
pref
"privacy.webrtc.globalMuteToggles"
jpeg-xl
description
"JPEG-XL"
owner
: krosylight@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether or not to enable JPEG-XL support.
setPref
branch
: user
pref
"image.jxl.enabled"
css-masonry
description
"CSS Masonry Layout"
owner
: dholbert@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
description
: Whether or not to enable CSS masonry layout.
setPref
branch
: user
pref
"layout.css.grid-template-masonry-value.enabled"
windowsUIAutomation
description
: Support for the Windows UI Automation API
owner
: jteh@mozilla.com
hasExposure
: false
variables
enabled
type
: int
description
: 0 to disable UIA, 2 to enable UIA.
enum
- 0
- 2
setPref
branch
: user
pref
"accessibility.uia.enable"
expandSignInButton
description
"Add text next to the FxA avatar toolbar icon"
owner
: skhamis@mozilla.com
hasExposure
: false
variables
ctaCopyVariant
description
: >-
One
of the following values:
- fxa-avatar-sign-in
- fxa-avatar-sign-up
empty will be assumed default experience
type
: string
contextID
description
: >-
Controls the behaviour of the context ID, which is a unique identifier used
by Contextual Services.
owner
: mconley@mozilla.com
hasExposure
: false
variables
rotationPeriodInDays
type
: int
setPref
branch
: user
pref
"browser.contextual-services.contextId.rotation-in-days"
description
: >-
The number of days since the creation of the context ID after which the
context ID should be regenerated. Set to 0 to disable rotation. This
value only takes effect if rustBackendEnabled is also true, otherwise
no rotation will occur regardless of the value.
This setting will only be applied after the next restart.
rustBackendEnabled
type
: boolean
setPref
branch
: user
pref
"browser.contextual-services.contextId.rust-component.enabled"
description
: >-
Enables the Rust component backend for ContextId.sys.mjs, which is
a prerequisite for doing rotations.
deletePrivate
description
: Enable or disable the option for users to delete files at the end of a private browsing session
owner
: rking@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: default
pref
: browser.download.enableDeletePrivate
description
: Whether the setting for deleting files downloaded in private browsing is available to the user
ipProtection
description
: Prefs to control IP Protection feature
owner
: fchasen@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.ipProtection.enabled
description
: >-
Enables the IP Protection feature.
webApps
description
: Enables or disables web apps.
owner
: nrishel@mozilla.com
hasExposure
: false
variables
enabled
type
: boolean
setPref
branch
: user
pref
: browser.taskbarTabs.enabled
description
: >-
Controls whether web apps can be installed and accessed.
defaultWindowsLaunchOnLogin
description
: >-
Controls whether or not new Windows users get defaulted to launch on login
owner
: drubino@mozilla.com
hasExposure
: true
exposureDescription
: >-
Exposure event is triggered if Windows policy allows launch on login.
variables
enabled
type
: boolean
description
: >-
If true, and allowed by Windows policy, a new user will be defaulted
to have Firefox launched when they log on.
passwordManager
description
: Password manager related prefs
owner
: maltejur@mozilla.com
hasExposure
: false
variables
reencryptionNeeded
isEarlyStartup
: true
type
: boolean
setPref
branch
: default
pref
: signon.reencryptionNeeded
description
: >-
Triggers a reencryption of all passwords on the next startup for
migration purposes.
xpcom
description
: Prefs that control the cross-platform component object model
owner
: tthorne@mozilla.com
hasExposure
: false
variables
idle_period_cross_process_scheduling
description
: Whether Firefox allows background processes to use idle time to schedule and run tasks.
type
: boolean
setPref
branch
: user
pref
"idle_period.cross_process_scheduling"
low_commit_space_threshold_mb
description
: if defined(XP_WIN) || defined(XP_LINUX) - notify TabUnloader or send the memory pressure if the memory resource notification is signaled AND the available commit space is lower than this value.
type
: int
setPref
branch
: user
pref
"browser.low_commit_space_threshold_mb"
low_commit_space_threshold_percent
description
: ifdef XP_LINUX - on Linux we also check available memory in comparison to total memory, and use this percent value (out of 100) to determine if we are in a low memory scenario.
type
: int
setPref
branch
: user
pref
"browser.low_commit_space_threshold_percent"
layout
description
: Prefs that control the DOM or core layout.
owner
: tthorne@mozilla.com
hasExposure
: false
variables
lower_priority_refresh_driver_during_load
description
: Reduces refresh rate between fcp and load. The value is TRUE is there to improve page load.
type
: boolean
setPref
branch
: user
pref
"layout.lower_priority_refresh_driver_during_load"
sessionstore_max_tabs_undo
description
: How many tabs can be reopened per window.
type
: int
setPref
branch
: user
pref
"browser.sessionstore.max_tabs_undo"
sessionstore_max_windows_undo
description
: How many windows will be saved and can be reopened per session - on non-macOS platforms this pref may be ignored when dealing with pop-up windows to ensure the user actually gets at least one window with a menu bar.
type
: int
setPref
branch
: user
pref
"browser.sessionstore.max_windows_undo"
sessionstore_interval
description
: Minimum interval between two save operations in milliseconds (while the user is active).
type
: int
setPref
branch
: user
pref
"browser.sessionstore.interval"
sessionhistory_max_total_viewers
description
: Number of content viewers to cache based. If negative, determined by amount of available memory.
type
: int
setPref
branch
: user
pref
"browser.sessionhistory.max_total_viewers"
smooth_scroll
description
: Whether to enable smooth scrolling.
type
: boolean
setPref
branch
: user
pref
"general.smoothScroll"
frame_rate
description
: Pref to control browser frame rate, in Hz.
type
: int
setPref
branch
: user
pref
"layout.frame_rate"
frame_rate_throttled
description
: Throttled frame rate, in frames per second.
type
: int
setPref
branch
: user
pref
"layout.throttled_frame_rate"
min_background_timeout_value_without_budget_throttling
description
: Minimum interval for background tabs when budget throttling is disabled, in milliseconds.
type
: int
setPref
branch
: user
pref
"dom.min_background_timeout_value_without_budget_throttling"
timeout_throttling_delay
description
: Delay before throttling activates after tab goes background, in milliseconds.
type
: int
setPref
branch
: user
pref
"dom.timeout.throttling_delay"
initialpaint_delay
description
: Reduces the time Firefox waits before starting to render a page.
type
: int
setPref
branch
: user
pref
"nglayout.initialpaint.delay"
initialpaint_delay_oopif
description
: Reduces the time Firefox waits before starting to render a page in out-of-process iframes.
type
: int
setPref
branch
: user
pref
"nglayout.initialpaint.delay_in_oopif"
page_load_deprioritization_period
description
: Time in milliseconds during which certain tasks are deprioritized during page load.
type
: int
setPref
branch
: user
pref
"page_load.deprioritization_period"
ipc
description
: Prefs that control the inter-process communication system.
owner
: tthorne@mozilla.com
hasExposure
: false
variables
backend_mach
description
: if defined(XP_DARWIN) - Whether or not to use the mach-based IPC backend on macOS/iOS. Only read once at startup by IOThreadParent
's constructor.
type
: boolean
setPref
branch
: user
pref
"dom.ipc.backend.mach"
process_count
description
: The max number of content processes used for non-isolated origins.
type
: int
setPref
branch
: user
pref
"dom.ipc.processCount"
process_count_web_isolated
description
: Maximum number of isolated content processes per-origin.
type
: int
setPref
branch
: user
pref
"dom.ipc.processCount.webIsolated"
preallocated_process_count
description
: Process preallocation cache. Only used in fission; in e10s we use 1 always.
type
: int
setPref
branch
: user
pref
"dom.ipc.processPrelaunch.fission.number"
preallocated_lowmem_mb
description
: Limit preallocated processes below this memory size (in MB).
type
: int
setPref
branch
: user
pref
"dom.ipc.processPrelaunch.lowmem_mb"
priority_manager_enabled
description
: Determines whether Firefox uses the Process Priority Manager to adjust CPU priority based on importance.
type
: boolean
setPref
branch
: user
pref
"dom.ipc.processPriorityManager.enabled"
priority_manager_background_grace_period_ms
description
: The waiting period before Firefox begins lowering the priority of a content process after it goes into background.
type
: int
setPref
branch
: user
pref
"dom.ipc.processPriorityManager.backgroundGracePeriodMS"
priority_manager_background_perceivable_grace_period_ms
description
: The waiting period before Firefox begins lowering the priority of a content process that is still considered
"perceivable"
type
: int
setPref
branch
: user
pref
"dom.ipc.processPriorityManager.backgroundPerceivableGracePeriodMS"
priority_manager_background_uses_ecoqos
description
: Windows only. Determines whether Firefox should use EcoQoS mode for power efficiency.
type
: boolean
setPref
branch
: user
pref
"dom.ipc.processPriorityManager.backgroundUsesEcoQoS"
graphics
description
: Prefs that control media and/or graphics processing.
owner
: tthorne@mozilla.com
hasExposure
: false
variables
gfx_webrender_all
description
: Whether to use the WebRender hardware backend.
type
: boolean
setPref
branch
: user
pref
"gfx.webrender.all"
layers_acceleration_force_enabled
description
: Whether to force acceleration on, ignoring blacklists.
type
: boolean
setPref
branch
: user
pref
"layers.acceleration.force-enabled"
image
description
: Prefs that control image processing.
owner
: tthorne@mozilla.com
hasExposure
: false
variables
image_cache_size
description
: The maximum size, in bytes, of the decoded images we cache.
type
: int
setPref
branch
: user
pref
"image.cache.size"
image_mem_decode_bytes_at_a_time
description
: Chunk size for calls to the image decoders.
type
: int
setPref
branch
: user
pref
"image.mem.decode_bytes_at_a_time"
walletCustomSchemes
description
: Defines which custom schemes are treated as digital identity requests
owner
: bvandersloot@mozilla.com
hasExposure
: false
variables
enabledSchemes
type
: string
setPref
branch
: user
pref
: privacy.wallet_schemes
description
: >-
Comma separated lists of schemes
This page was generated by
Searchfox