How to
- Tracking Protection on Firefox Focus for iOS Redirect 1
- Tracking Protection on Firefox Klar for iOS
- Transfer information from old Firefox Nightly (Android) to the new Firefox Nightly release
- Transfer information from old Firefox Nightly (Android) to the new Firefox Nightly release Redirect 1
- Transfer information from the old to new Firefox for Android (Nightly or Beta)
- Translate web pages in Firefox for iOS
- Travel deals and guides in Firefox Lite
- Troubleshoot Firefox OS
- "Troubleshooting" article type best practices
- Troubleshooting Firefox OS
- Troubleshoot issues related to add-ons
- Troubleshoot Mode Thunderbird
- Troubleshoot Mozilla VPN connection problems
- Troubleshoot security error codes on secure websites
- Try Mozilla VPN for free on your iOS mobile device
- Try Mozilla VPN for free on your mobile device
- Turn off ads on MDN Plus
- Turn off web fonts in Firefox for Android
- Turn off web fonts on Firefox for Android
- Turn on Airplane Mode
- Turn on Mozilla VPN on your desktop computer
- Turn on/off saved logins, login sync and login autofill in Firefox for Android
- Turn on/off saved logins, login sync and login autofill in Firefox for Android Beta
- Turn on/off saved logins, login sync and login autofill in Firefox Preview
- Turn on the Mozilla VPN on Android
- Turn on the Mozilla VPN on iOS
- Turn on the Mozilla VPN on your desktop computer
- Turn on Turbo Mode on Firefox for Fire TV
- Turn on Turbo Mode (Tracking Protection) for Firefox for Fire TV
- Turn picture-in-picture mode controls on and off
- Turn push notifications on or off in Firefox for iOS
- Turn search suggestions on or off on Firefox for iOS
- Turn search suggestions on or off onFirefox for iOS
- Turn Turbo Mode off or on on Firefox for Fire TV
- Unable to make video calls while Firefox Private Network is on
- Unable to set Firefox as the default browser for iOS
- Unable to use Whatsapp on Firefox OS
- Understand Encrypted Client Hello (ECH)
- Understanding in depth the profile per installation feature
- Understanding the limitations of Popcorn Maker and avoiding headaches
- Understanding the risks of installing self-hosted extensions
- Unified Toolbar
- Unify your POP email accounts with a global inbox
- Uninstall apps
- Uninstall apps on Firefox OS
- Uninstall Firefox for Android
- Uninstall Firefox for Android add-ons
- Uninstall Firefox for Android extensions
- Uninstall Firefox for iOS
- Uninstall Firefox from your Android device
- Uninstall Firefox from your computer
- Uninstalling add-ons
- Uninstalling Firefox
- Uninstalling Internet Explorer
- Uninstall Thunderbird from your computer
- Unistall Firefox from your computer
- Unlink your Google or Apple ID from your Firefox account
- Unlink your Google or Apple ID from your Mozilla account
- Unload inactive tabs to save system memory in Firefox
- Unload tabs to reduce system memory usage in Firefox
- Unsubscribing From Pocket's emails
- Update Firefox OS to a new version
- Update Firefox Preview to the latest version
- Update Firefox to prevent add-ons issues from root certificate expiration
- Update Firefox to the latest release
- Update Firefox to the latest version
- Update McAfee Security Center and firewall settings to allow Firefox access to the Internet
- Update Thunderbird to the latest version
- Update to a new Firefox OS version
- Update to a new version
- Update to the latest version of Firefox for Android
- Update to the latest version of Firefox for Android Beta
- Update to the latest version of Firefox on Android
- Updating Firefox
- Updating Thunderbird
- Upgrade Firefox for Mobile Beta
- Upgrade your graphics drivers to use hardware acceleration and WebGL
- Upgrade your Pocket subscription
- Upgrade your subscription
- Upgrading from an older version of Thunderbird
- Upgrading from Firefox 1
- Upgrading from Thunderbird 2 to 3
- Upgrading from Thunderbird 3.1
- Upgrading to Firefox 3.6
- Upgrading to the new version of Firefox (84+) on Apple Silicon
- Usage Data Changes for Firefox for iOS and Android
- Use Adaptive Search to discover personalized apps
- Use Adobe Reader to view PDF files in Firefox
- Use a Master Password to protect stored logins and passwords
- Use a Master Password to protect stored logins and passwords Redirect 1
- Use a Primary Password to protect stored logins and passwords
- Use a Primary Password to protect stored logins and passwords Redirect 1
- Use a Primary Password with Sync
- Use bookmark folders to organize your bookmarks
- Use bookmarklets to quickly perform common web page tasks
- Use bookmarks on Firefox for Android to keep track of your favorite websites
- Use extensions to add features to Firefox
- Use Face ID on Firefox Focus for iOS
- Use Face ID or Touch ID on Firefox Klar
- Use Firefox Accounts to manage your Marketplace apps