Privacy and security | Firefox Help

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Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see
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Firefox Terms of Use FAQ
Frequently asked questions about Firefox Terms of Use.
Firefox, Firefox for Android, Firefox for iOS
Firefox, Firefox for Android, Firefox for iOS
6/17/25
Common Myths about Private Browsing
Learn more about common misconceptions about Private Browsing in Firefox.
Firefox
Firefox
11/3/25
Enhanced Tracking Protection in Firefox for desktop
Enhanced Tracking Protection in Firefox automatically protects your privacy as you browse.
Firefox
Firefox
3/24/26
Insecure connection password warning in Firefox
Firefox will show you a "connection is not secure" warning message when a website login page is insecure and information could be stolen.
Firefox
Firefox
3/19/26
Avoid and report Mozilla tech support scams
Mozilla does not provide telephone support and does not charge for software downloads, upgrades or technical help. Learn more.
Firefox, Firefox for Android, Firefox for iOS,...
Firefox, Firefox for Android, Firefox for iOS, Thunderbird
2/3/25
Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
Firefox
Firefox
10/26/24
Configure DNS over HTTPS protection levels in Firefox
DNS over HTTPS (DoH) is a recommended feature that enhances privacy. Learn more about the DoH protection levels you can configure in Firefox settings.
Firefox
Firefox
3/27/25
Sponsors on the home page and New Tab page
Working with its advertising partners, Mozilla may place sponsored shortcuts on the default Firefox home page and New Tab page. Learn more.
Firefox
Firefox
1/20/26
Does Firefox share my location with websites?
Learn what information Firefox sends to websites about your location and how to use and manage location-aware features of your browser.
Firefox
Firefox
3/22/26
Firefox Password Manager - Alerts for breached websites
Firefox's password management will show you alerts about logins potentially exposed in data breaches and passwords that may be vulnerable.
Firefox, Mozilla Monitor
Firefox, Mozilla Monitor
3/23/26
Introducing Total Cookie Protection in Standard Mode
Firefox users now have access to Total Cookie Protection by default. Find all you need to know about it in this article.
Firefox
Firefox
5/20/25
Automatically fill in credit card and payment method data on Web forms
Manage credit card autofill settings in Firefox version 81 and above.
Firefox
Firefox
3/18/26
Pop-up blocker settings, exceptions and troubleshooting
Learn how to block or allow pop-ups in Firefox and how third-party redirect blocking enhances your browsing protection.
Firefox
Firefox
3/14/26
Global Privacy Control
How to make Firefox advise websites that you visit not to sell or share your browsing information.
Firefox
Firefox
3/18/26
How to manage your camera and microphone permissions with Firefox
How to enable or block sites from accessing your camera and microphone on your desktop or mobile device.
Firefox
Firefox
8/22/25
How do I tell if my connection to a website is secure?
Firefox uses a padlock icon next to a website's URL to let you know your connection is encrypted. Click the icon for more information.
Firefox
Firefox
3 days ago
Private Browsing - Use Firefox without saving history
Firefox Private Browsing is great for viewing websites without saving things such as cookies, temp files and a history of the pages you visit.
Firefox
Firefox
2/22/25
Trackers and scripts Firefox blocks in Enhanced Tracking Protection
Learn how Firefox blocks common trackers and harmful scripts, to reduce the ability of third parties to collect data about your browsing.
Firefox
Firefox
3/18/26
Manage remote improvements settings in Firefox
How to manage remote improvement settings in Firefox version 148 and above.
Firefox, Firefox for Android, Firefox for iOS
Firefox, Firefox for Android, Firefox for iOS
1/13/26
HTTPS-Only Mode in Firefox
Learn more about HTTPS-Only Mode which forces all connections to websites to use HTTPS.
Firefox
Firefox
3/15/26
Use a Primary Password to protect stored logins and passwords
Setting a Primary (formerly "Master") password in Firefox is helpful if your share your computer with others. We'll explain how it works.
Firefox
Firefox
2 weeks ago
Delete browsing, search and download history on Firefox
Learn what information is stored in your Firefox history and how to clear all or part of it if you are using a public or shared computer.
Firefox
Firefox
3/21/26
How does built-in Phishing and Malware Protection work?
Firefox contains built-in Phishing and Malware Protection to help keep you safe online. This article explains how they work.
Firefox
Firefox
1/12/24
Secure website certificate
Websites can present Firefox with a certificate to identify themselves. Find out how Firefox checks the authenticity of the sites you visit.
Firefox
Firefox
3/13/26
Manage technical and interaction data collection settings in Firefox
Learn what technical and interaction data Firefox collects, how it’s used, and how to manage or opt out on desktop, Android and iOS.
Firefox, Firefox for Android, Firefox for iOS
Firefox, Firefox for Android, Firefox for iOS
3/23/26
Firefox security features warning on Linux
Create an AppArmor profile for Firefox on Linux.
Firefox
Firefox
3/5/25
How do I turn on the Do Not Track feature?
This article describes the “Do Not Track” feature in Firefox 134 and below, that lets you tell websites not to track your browsing behavior.
Firefox
Firefox
3/4/26
Protect privacy while using Web Authentication
Learn about Web Authentication, a powerful anti-phishing technology.
Firefox
Firefox
12/1/24
Search suggestions in Firefox
Learn more about how search suggestions work in Firefox.
Firefox
Firefox
3/7/26
Manage daily usage ping data collection settings in Firefox
Learn how to manage daily usage ping data collection settings in Firefox.
Firefox, Firefox Focus, Firefox for Android,...
Firefox, Firefox Focus, Firefox for Android, Firefox for iOS
3/18/26
Firefox connection upgrades - HTTP to HTTPS
Firefox upgrades connections from HTTP to HTTPS to enhance security and protect your data. Learn about server- and browser-initiated upgrades and how they work.
Firefox, Firefox for Android
Firefox, Firefox for Android
7/18/25
Automatically trust third-party root certificates
Root certificates are the backbone of the security system that underpins HTTPS web traffic. Firefox, like most web browsers, includes a pre-installed set of trusted root certificates.
Firefox
Firefox
11/21/23
Control personal device and local network permissions in Firefox
Learn why Firefox now asks permission before allowing sites to access your personal device or local network.
Firefox
Firefox
1/26/26
Add Firefox Relay to the Firefox password manager
Integrate Firefox Relay into the password manager to conveniently generate or reuse email masks from within email fields. Learn how.
Firefox, Firefox Relay
Firefox, Firefox Relay
2 days ago
How do I set up Sync on my computer?
Use a Mozilla account to sync your bookmarks, history, passwords, add-ons and open tabs with another device, profile or version of Firefox.
Firefox, Mozilla Account
Firefox, Mozilla Account
1 week ago
How to use Firefox containers
This article explains how to use Firefox containers with the Multi-Account Containers extension, to organize your online activities.
Firefox
Firefox
8/8/25
Why are some add-ons not allowed on sites restricted by Mozilla?
Learn why some Firefox add-ons might not work on certain websites and how to manage those extensions to enhance your browsing experience.
Firefox
Firefox
6/24/25
SmartBlock for Enhanced Tracking Protection
SmartBlock lets pages load more fully, with less breakage – all while keeping those tracking scripts blocked.
Firefox
Firefox
4/13/25
Resist Fingerprinting
Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.
Firefox
Firefox
11/25/25
Troubleshoot Firefox issues caused by malware
Malware is software designed to invade a computer without your knowledge. We'll explain common symptoms, how to prevent it being installed and how to remove it.
Firefox
Firefox
9/24/22
Crash reports in Firefox for Desktop
Learn about backlogged crash reports, how Firefox handles them and how to manage the setting to allow or prevent automatically sending crash reports
Firefox
Firefox
12/16/25
Manage Enhanced Tracking Protection exceptions
Learn how to manage Enhanced Tracking Protection exceptions.
Firefox, Firefox for Android
Firefox, Firefox for Android
9/24/25
How do I choose what information to sync on Firefox?
Learn how to select what information (bookmarks, add-ons, browsing history and other data) to share across your devices with Firefox Sync.
Firefox, Firefox for Android, Firefox for iOS,...
Firefox, Firefox for Android, Firefox for iOS, Mozilla Account
3 weeks ago
Mixed content blocking in Firefox
Firefox automatically blocks insecure or mixed content from secure web pages. We'll explain what that means.
Firefox
Firefox
3/3/26
Firefox DNS over HTTPS
DoH improves privacy by hiding domain name lookups from anyone lurking on public Wi-Fi, your ISP or others on your local network. Learn more.
Firefox
Firefox
6/5/25
I found a fake Firefox update
What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.
Firefox
Firefox
3 weeks ago
Share browser windows or your screen with sites you trust
Learn how to use Firefox's screen sharing feature safely.
Firefox
Firefox
1/11/17
Mozilla service providers and partners
Mozilla uses third-party service providers and trusted partners to help provide the Firefox desktop browser and related services. Learn what's shared and more.
Firefox
Firefox
1/5/26
Manage marketing data settings in Firefox for Desktop
Learn how Firefox Desktop collects marketing data, how Mozilla uses it, and how you can manage or opt out of marketing data sharing.
Firefox
Firefox
3/6/25
How to stop Firefox from making automatic connections
Learn about the various reasons why Firefox makes automatic connections to the Internet and how you can stop it from doing so if you wish.
Firefox
Firefox
7/24/25
Remove a synced device from your Mozilla account
Disconnect a device from your Mozilla account and stop syncing its data.
Firefox, Mozilla Account
Firefox, Mozilla Account
10/23/23
Manage your logins with the Firefox Password Manager
Manage your saved logins and passwords on desktop Firefox with the built-in password management feature.
Firefox
Firefox
1/24/24
Autofill logins on Firefox
Firefox lets you control whether or not to autofill your logins and passwords.
Firefox
Firefox
2/19/24
Site Permissions panel
If you allow or block permissions for a website, the address bar will show a Permissions icon that opens the Permissions panel. Learn more.
Firefox
Firefox
3 weeks ago
Site Information panel
The Site Information panel in Firefox tells you about a website's connection security and identity. Learn more.
Firefox
Firefox
2 weeks ago
Disable Firefox Sync
Learn how to turn off Firefox Sync if you’d like to use your Mozilla account without syncing data such as, bookmarks, history and tabs.
Firefox, Mozilla Account
Firefox, Mozilla Account
4/19/25
Understand Encrypted Client Hello (ECH)
Firefox version 118 introduced a security enhancement called Encrypted Client Hello (ECH), enabled by default in Firefox 119. Learn more.
Firefox
Firefox
7/15/25
How Firefox Sync keeps your data safe even if TLS fails
Firefox Sync encrypts your data before it ever leaves your device, and ensures that the password to unlock this encryption is never transmitted to the server.
Firefox, Mozilla Account
Firefox, Mozilla Account
9/18/25
Block and unblock websites with parental controls on Firefox
This article explains how to block websites or filter website content in Firefox that may be offensive or inappropriate for children.
Firefox
Firefox
8/11/22
Disable Firefox Sync on a lost phone or tablet
This article describes what you should do to prevent someone from accessing your passwords on a lost device with Firefox Sync.
Firefox, Firefox for Android, Firefox for iOS,...
Firefox, Firefox for Android, Firefox for iOS, Mozilla Account
2/6/25
Change your Mozilla account password
How to change your Mozilla account password if you detect strange activity on your account.
Firefox, Mozilla Account
Firefox, Mozilla Account
5/19/25
Change your two-step authentication device for your Mozilla account
What to do if you have two-factor authentication (2FA) setup on your account and need to migrate to a new device or phone.
Firefox, Firefox for Android, Firefox for iOS,...
Firefox, Firefox for Android, Firefox for iOS, Mozilla Account
2/6/25
Firefox privacy and security features
Check Firefox's most advanced features and settings for safe, private online browsing.
Firefox
Firefox
10/22/24
Disable password saving in Firefox
If you’re using a shared device and don’t want Firefox to remember your passwords, you can change your preferences in Firefox settings.
Firefox
Firefox
1/23/24
Sign in to a Mozilla account using 3rd-party authentication
You can use your existing Google or Apple ID to sign up for a Mozilla account. Learn more.
Firefox, Mozilla Account
Firefox, Mozilla Account
3/9/26
Oblivious HTTP (OHTTP) explained
One of the technologies used in Firefox to enhance online privacy is Oblivious HTTP (OHTTP). Learn what it is, how it works and how it helps protect your data.
Firefox, Firefox for Android, Firefox for iOS
Firefox, Firefox for Android, Firefox for iOS
3/5/26
Certificate contains the same serial number as another certificate
Why Firefox may show you a Secure Connection Failed error when you try to access the configuration page for your router and what to do.
Firefox
Firefox
9/2/25
Telemetry collection - Windows default browser trends
This article explains one example of how Firefox collects and uses telemetry data with the Default Browser Agent Windows scheduled task.
Firefox
Firefox
3/5/25
Total Cookie Protection and website breakage FAQ
Learn about Enhanced Tracking Protection and Total Cookie Protection in Firefox, and how to troubleshoot and report possible site breakage.
Firefox
Firefox
10/11/24
How do I share Firefox between people on a computer?
Firefox can be used by several people on a single computer. Learn the basic protections to prevent others form accessing your private data.
Firefox
Firefox
1/30/26
Suspicious activity on my Mozilla account
How to protect yourself if suspicious activity is detected on your Mozilla account.
Firefox, Firefox for Android, Mozilla Account
Firefox, Firefox for Android, Mozilla Account
2 weeks ago
How do I know the status of my sync?
The Mozilla account toolbar icon tells you when you are signed in and syncing Firefox data. You can personalize it with your own avatar.
Firefox, Mozilla Account
Firefox, Mozilla Account
10/19/25
How Firefox securely saves passwords
Learn how Firefox securely saves your passwords.
Firefox, Mozilla Account
Firefox, Mozilla Account
10/28/25
DNS over HTTPS (DoH) FAQs
We have outlined a list of FAQs here that you may find helpful while getting up to speed with all that DNS over HTTPS (DoH) has to offer.
Firefox
Firefox
12/2/24
Primary Password is replacing Master Password
Primary Password is replacing Master Password. Learn more about why we are making this change.
Firefox
Firefox
9/5/25
Encrypted Client Hello (ECH) - Frequently asked questions
Encrypted Client Hello (ECH) is a security feature in major Web browsers, available in Firefox 118 and enabled by default in Firefox 119. Learn more.
Firefox
Firefox
8/6/24
Data Loss Prevention
Seeing the DLP icon in Firefox? Here’s what it means and how it helps protect your data.
Firefox, Firefox for Enterprise
Firefox, Firefox for Enterprise
11/5/24
HTTPS-First upgrades to secure connections
From version 136, Firefox implements HTTPS-First and always attempts to connect securely. If a secure connection fails it falls back to an insecure connection.
Firefox
Firefox
1/30/25
Harmful add-on protection
If you have installed an add-on that triggers the opening of a known malicious website, Firefox will block it to protect you.
Firefox
Firefox
2/12/26
Statistics for Firefox Homepage Sponsors
Learn how Firefox Homepage Sponsors aggregates statistics and how it protects your privacy.
Firefox
Firefox
Created:
1 week ago
Create secure passwords to keep your identity safe
Choosing more secure passwords will help keep your identity safe on the internet. Learn how to create secure, easy-to-remember passwords.
Firefox
Firefox
5/14/25
Share data with Mozilla to help improve Firefox
The Telemetry feature sends us performance and usage data to help measure how Firefox behaves in the real world and improve it. Learn more.
Firefox
Firefox
3/7/25
How to stay safe on the web
There are many scams, viruses and other dangers out in the Web. Take these simple steps to protect your computer and personal information.
Firefox, Privacy and Security
Firefox, Privacy and Security
5/14/25
About Firefox Desktop Attribution
When you download and install Firefox, a "download token" is used, so Mozilla can identify how you reached the download page. Learn more.
Firefox
Firefox
3/6/25
"Certificate cannot be trusted" warning in Kazakhstan
Firefox is blocking the use of Kazakhstan root CA certificate to protect your privacy. Learn more about how to stay safe.
Firefox
Firefox
8/21/19
Browsing history in Firefox - View the websites you have visited
Firefox keeps track of the websites you visit when you browse the Web. Learn how to view, search and sort your browsing history.
Firefox
Firefox
9/22/23
Telemetry collection and deletion
Firefox collects telemetry data by default and sends this data to Mozilla, to help improve Firefox performance and stability. Learn more.
Firefox
Firefox
3/5/25
My privacy settings were changed from Custom to Standard
If your Custom settings match the settings in Standard, you will be switched back to Standard. This will not affect your settings.
Firefox
Firefox
3/24/21
Compatibility with Exploit protection on Windows
Firefox Compatibility with Windows Exploit protection.
Firefox
Firefox
6/29/22
Recommended Firefox privacy and security settings for families
Firefox lets you customize privacy and security settings so you and your family can browse safely online. Learn more.
Firefox
Firefox
3/5/25
Disable credit card and payment method syncing across devices
Disable credit cards and payment method syncing to prevent unwanted purchases on your shared devices.
Firefox
Firefox
3/22/24
Block deceptive content and dangerous downloads in Firefox
Make sure these settings are enabled to prevent unwanted downloads and block suspicious content on your children's sessions.
Firefox
Firefox
8/12/22
Privacy-Preserving Attribution
Firefox 128 introduces privacy-preserving attribution, allowing advertisers to measure campaign performance while protecting user privacy.
Firefox
Firefox
11/19/25
How Review Checker preserves user privacy
Learn how Review Checker uses OHTTP to securely send product info to Fakespot, ensuring no personal data or browsing details are shared.
Firefox
Firefox
10/4/25
Use built-in VPN in Firefox
Learn how to activate and use the built-in VPN feature in Firefox to protect your browsing.
Firefox
Firefox
7 hours ago
Understand unexpected script warnings in Firefox
Learn what unexpected script warnings in Firefox mean, why they happen, and what you should do if you see one.
Firefox
Firefox
8/20/25
Firefox Homepage Lift Studies
Learn how optional sponsored shortcuts on the Firefox homepage support Mozilla, respect your privacy, and how effectiveness is measured without tracking.
Firefox
Firefox
11/29/25
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