Privacy and security
Learn how to protect your privacy and secure your data.
Common Myths about Private Browsing
Learn more about common misconceptions about Private Browsing in Firefox.
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Enhanced Tracking Protection in Firefox for desktop
Enhanced Tracking Protection in Firefox automatically protects your privacy while you browse.
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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.
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Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
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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.
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Automatically fill in credit card and payment method data on Web forms
Manage credit card autofill settings in Firefox version 81 and above.
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Configure DNS over HTTPS protection levels in Firefox
DNS over HTTPS (DoH) is a recommended feature that enhances privacy for everyone. When you type a web address into your address bar, Firefox sends a secure DNS request to look up the IP address for that website over the Internet and make sure it's secure. In this article, we explain all the DoH protection levels you can configure from the Firefox settings.
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2 weeks, 5 days ago
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.
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Sponsored shortcuts on the 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.
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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.
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HTTPS-Only Mode in Firefox
Learn more about HTTPS-Only Mode which forces all connections to websites to use HTTPS.
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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.
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Protect privacy while using Web Authentication
Learn about Web Authentication, a powerful anti-phishing technology.
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3 weeks, 5 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.
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Pop-up blocker settings, exceptions and troubleshooting
Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.
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Secure your Mozilla account with two-step authentication
Protect your Mozilla account with two-step authentication.
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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.
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Trackers and scripts Firefox blocks in Enhanced Tracking Protection
Blocks many common trackers and harmful scripts and reduces the ability of third parties to collect data about your browsing behavior
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Privacy-Preserving Attribution
Firefox 128 introduces privacy-preserving attribution, allowing advertisers to measure campaign performance while protecting user privacy.
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Global Privacy Control
How to make Firefox advise websites that you visit not to sell or share your browsing information.
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3 weeks, 3 days ago
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.
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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.
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3 weeks ago
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.
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How do I turn on the Do Not Track feature?
Firefox lets you tell websites not to track your browsing behavior. Learn what tracking is and how to turn on the “Do Not Track” feature.
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3 weeks, 3 days ago
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.
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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.
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SmartBlock for Enhanced Tracking Protection
SmartBlock lets pages load more fully, with less breakage — all while keeping those tracking scripts blocked.
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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.
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1 week, 4 days ago
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.
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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.
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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.
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4 weeks ago
Search suggestions in Firefox
Learn more about how search suggestions work in Firefox.
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Mixed content blocking in Firefox
Firefox automatically blocks insecure or mixed content from secure web pages. We'll explain what that means and what options you have.
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How to use Firefox containers
This article explains how to use Firefox containers with the Multi-Account Containers extension, to organize your online activities.
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Resist Fingerprinting
Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.
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My sign in was “blocked for security reasons” on Mozilla account
Mozilla account blocks sign in attempts if it detects unusual activity. Learn how to unblock your account.
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Why do I get a harmful download message when downloading Firefox on Windows?
You may see a warning that the installer could harm your device when attempting to download Firefox from another browser. Learn more.
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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 on the icon for more information.
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Site Information panel
The Site Information panel in Firefox tells you about a website's connection security and identity. Learn more.
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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.
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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.
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3 weeks, 4 days ago
Autofill logins on Firefox
Firefox lets you control whether or not to autofill your logins and passwords.
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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.
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Secure Firefox passwords with device sign-in
Learn more about this Firefox anti-snooping feature designed to protect your logins and passwords from unauthorized access.
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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.
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3 weeks, 5 days ago
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.
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How Firefox securely saves passwords
Learn how Firefox securely saves your passwords.
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4 weeks ago
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.
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3 weeks, 4 days ago
Firefox privacy and security features
Check Firefox's most advanced features and settings for safe, private online browsing.
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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.
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3 weeks, 1 day ago
Remove a synced device from your Mozilla account
Disconnect a device from your Mozilla account and stop syncing its data.
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Manage your logins with the Firefox Password Manager
Manage your saved logins and passwords on desktop Firefox with the built-in password management feature.
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Delete sync data from Firefox by signing out of your Mozilla account
How to sign out of your Mozilla account and remove your synced data from a device.
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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.
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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.
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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.
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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.
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Change your Mozilla account password
How to change your Mozilla account password if you detect strange activity on your account.
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4 weeks, 1 day ago
Suspicious activity on my Mozilla account
How to protect yourself if suspicious activity is detected on your Mozilla account.
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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.
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Primary Password is replacing Master Password
Primary Password is replacing Master Password. Learn more about why we are making this change.
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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.
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3 weeks ago
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.
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3 weeks, 4 days ago
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.
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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.
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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.
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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.
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1 week, 3 days ago
"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.
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Changing 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.
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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.
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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.
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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.
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Disable credit card and payment method syncing across devices
Disable credit cards and payment method syncing to prevent unwanted purchases on your shared devices.
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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.
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Unlink your Google or Apple ID from your Mozilla account
If you no longer want to use your Google or Apple account to sign in to your Mozilla account, you can unlink it in your Mozilla account settings.
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