Common Myths about Private Browsing
Learn more about common misconceptions about Private Browsing in Firefox.
Last updated:
Use built-in VPN in Firefox
Learn how to activate and use the built-in VPN feature in Firefox to protect your browsing.
Last updated: 1 week ago
Firefox Terms of Use FAQ
Frequently asked questions about Firefox Terms of Use.
Last updated:
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.
Last updated:
Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
Last updated:
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.
Last updated:
Enhanced Tracking Protection in Firefox for desktop
Enhanced Tracking Protection in Firefox automatically protects your privacy as you browse.
Last updated: 1 week 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.
Last updated: 3 weeks ago
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.
Last updated:
Firefox security features warning on Linux
Create an AppArmor profile for Firefox on Linux.
Last updated:
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.
Last updated: 1 week ago
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.
Last updated:
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.
Last updated: 1 week ago
Search suggestions in Firefox
Learn more about how search suggestions work in Firefox.
Last updated:
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.
Last updated:
Protect privacy while using Web Authentication
Learn about Web Authentication, a powerful anti-phishing technology.
Last updated:
Global Privacy Control
How to make Firefox advise websites that you visit not to sell or share your browsing information.
Last updated: 1 week ago
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.
Last updated:
Manage remote improvements settings in Firefox
How to manage remote improvement settings in Firefox version 148 and above.
Last updated: 2 weeks ago
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.
Last updated:
SmartBlock for Enhanced Tracking Protection
SmartBlock lets pages load more fully, with less breakage – all while keeping those tracking scripts blocked.
Last updated:
I found a fake Firefox update
What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.
Last updated:
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.
Last updated:
Automatically fill in credit and debit card payment methods data on web forms
Manage autofill settings for credit and debit card payment methods in Firefox
Last updated: 1 week 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.
Last updated: 6 days ago
Share browser windows or your screen with sites you trust
Learn how to use Firefox's screen sharing feature safely.
Last updated:
Resist Fingerprinting
Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.
Last updated:
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.
Last updated:
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.
Last updated: 1 week ago
HTTPS-Only Mode in Firefox
Learn more about HTTPS-Only Mode which forces all connections to websites to use HTTPS.
Last updated: 1 week ago
Mixed content blocking in Firefox
Firefox automatically blocks insecure or mixed content from secure web pages. We'll explain what that means.
Last updated:
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.
Last updated: 6 days 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.
Last updated:
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.
Last updated: 1 week ago
Manage daily usage ping data collection settings in Firefox
Learn how to manage daily usage ping data collection settings in Firefox.
Last updated: 1 week ago
Site Information panel
The Site Information panel in Firefox tells you about a website's connection security and identity. Learn more.
Last updated:
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.
Last updated:
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.
Last updated: 1 week ago
How Firefox securely saves passwords
Learn how Firefox securely saves your passwords.
Last updated:
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.
Last updated:
How to use Firefox containers
This article explains how to use Firefox containers with the Multi-Account Containers extension, to organize your online activities.
Last updated: 2 days ago
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.
Last updated: 6 days ago
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.
Last updated: 4 days ago
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.
Last updated:
Remove a synced device from your Mozilla account
Disconnect a device from your Mozilla account and stop syncing its data.
Last updated:
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.
Last updated:
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.
Last updated:
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.
Last updated: 1 week ago
Change your Mozilla account password
How to change your Mozilla account password if you detect strange activity on your account.
Last updated:
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.
Last updated:
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.
Last updated: 1 week ago
Manage your logins with the Firefox Password Manager
Manage your saved logins and passwords on desktop Firefox with the built-in password management feature.
Last updated:
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.
Last updated:
Autofill logins on Firefox
Firefox lets you control whether or not to autofill your logins and passwords.
Last updated: 1 week ago
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.
Last updated:
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
Last updated: 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.
Last updated: 6 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.
Last updated: 2 days ago
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.
Last updated:
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.
Last updated:
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.
Last updated: 1 week ago
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.
Last updated:
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.
Last updated: 2 days ago
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.
Last updated: 1 day ago
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.
Last updated:
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.
Last updated:
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.
Last updated: 2 days 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.
Last updated: 1 week ago
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.
Last updated:
Firefox privacy and security features
Check Firefox's most advanced features and settings for safe, private online browsing.
Last updated:
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.
Last updated:
Privacy-Preserving Attribution
Firefox 128 introduces privacy-preserving attribution, allowing advertisers to measure campaign performance while protecting user privacy.
Last updated:
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.
Last updated:
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.
Last updated:
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.
Last updated:
Suspicious activity on my Mozilla account
How to protect yourself if suspicious activity is detected on your Mozilla account.
Last updated:
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.
Last updated:
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.
Last updated: 2 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.
Last updated: 1 day ago
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.
Last updated:
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.
Last updated:
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.
Last updated:
Compatibility with Exploit protection on Windows
Firefox Compatibility with Windows Exploit protection.
Last updated:
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.
Last updated: 1 day ago
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.
Last updated: 1 day ago
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.
Last updated: 1 week ago
Disable credit card and payment method syncing across devices
Disable credit cards and payment method syncing to prevent unwanted purchases on your shared devices.
Last updated: 2 days ago
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.
Last updated: 2 days ago
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.
Last updated: 8 hours ago
Data Loss Prevention
Seeing the DLP icon in Firefox? Here’s what it means and how it helps protect your data.
Last updated:
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.
Last updated:
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.
Last updated:
Manage Enhanced Tracking Protection exceptions
Learn how to manage Enhanced Tracking Protection exceptions.
Last updated: 1 day 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.
Last updated:
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.
Last updated:
Use breach alerts in Firefox
Learn how Firefox warns you about website data breaches and helps protect your accounts and passwords.
Created: 1 week ago
Statistics for Firefox Homepage Sponsors
Learn how Firefox Homepage Sponsors aggregates statistics and how it protects your privacy.
Created:
Unable to find the built-in VPN in Firefox
Some useful pointers if you are unable to access the built-in VPN in Firefox.
Last updated: 21 hours ago
