How to
- Delete bookmark folders in Firefox for Android
- Delete browsing, search and download history
- Delete browsing, search and download history on Firefox
- Delete cookies to remove the information websites have stored on your computer
- Delete recent browsing, search and download history
- Delete sync data from Firefox by signing out of Firefox Accounts
- Delete sync data from Firefox by signing out of your Mozilla account
- Delete Your Contacts On Firefox OS
- Deleting Bookmarks
- Deleting cookies
- Deleting email messages in Firefox OS
- Deleting email messages on Firefox OS
- Deleting Messages
- Deploy Firefox customizations on macOS
- Deploy Firefox on macOS using PKG and Jamf
- Deploy Firefox on Windows
- Deploy Firefox with extensions
- Deploy Firefox with language packs
- Deploy Firefox with MSI installers
- Deploying Firefox Customizations on macOS
- Deploying Firefox on MacOS using PKG and Jamf
- Deploying Firefox on Windows
- Deploying Firefox with extensions
- Deploying Firefox with Language Packs
- Different ways to access PDF files with Firefox
- Digitally Signing and Encrypting Messages
- Disable credit card and payment method syncing across devices
- Disable credit card syncing across devices
- Disable/delete an email alias on Firefox Relay
- Disable/delete an email mask on Firefox Relay
- Disable email forwarding - Stop receiving emails sent through your masks
- Disable email forwarding - Stop receiving emails sent to your aliases
- Disable email forwarding - Stop receiving emails sent to your masks
- Disable Firefox Sync
- Disable or re-enable Pocket for Firefox
- Disable or remove Add-ons
- Disable password saving in Firefox
- Disable Pocket for Firefox
- Disable Pocket in Firefox
- Disable Pocket on Firefox
- Disable third-party cookies in Firefox to stop some types of tracking by advertisers
- Disabling the included version of Pocket and toolbar button
- Disabling third party cookies
- Disconnect your Firefox Account from Fire TV
- Disconnect your Firefox Account from Lockwise
- Disconnect your Mozilla account from Fire TV
- Disconnect your Mozilla account from Lockwise
- Discontinuing the Tab Groups feature
- Discourse - Managing account data
- Discover page FAQ
- Display the Firefox button menu instead of the menu toolbar
- Display the Thunderbird button menu instead of the menu toolbar
- DNS-over-HTTPS (DoH) FAQs
- DNS-over-HTTPS FAQ
- Does Firefox Private Network work on other browsers?
- Does Firefox share my location with websites?
- Does Firefox share my location with Web sites?
- Does Firefox work on Windows 8 and Windows RT
- Does Firefox work on Windows 8 and Windows RT?
- Does Firefox work on Windows 8/RT?
- Does the Firefox Private Network extension work on other browsers?
- Do I have a Mozilla VPN subscription?
- Do I need an account to publish a project using Thimble?
- Do I need an account to publish a project using X-Ray Goggles?
- Domains to allow for Firefox
- DOM events changes introduced in Firefox 66
- DOM Inspector
- Do not track on Firefox OS
- Do-not-track on Firefox OS
- Do other participants need a Firefox account to join my room?
- Download And Install Applications on Firefox OS
- Download and install apps on Firefox OS
- Download and install apps on your Firefox OS phone
- Download and install Firefox for Android
- Download and install Firefox Mobile
- Download Firefox from the Microsoft Store
- Download Firefox on Windows from the Microsoft Store
- Download music, photos and video files
- Download music, photos and videos
- Download music, photos and videos on your device
- Download photos and files on Firefox for iOS
- Downloads in Firefox for Android
- Downloads window
- Download the Beta and Nightly versions of Firefox Focus for Android
- Download the Firefox Extended Support Release (ESR) version
- Drag and drop links and tabs to and from Firefox
- Drag links to and from Firefox Focus
- Drag links to and from Firefox Klar
- Dual SIM cards
- Dual SIM cards on Firefox OS
- Edit or delete a login from the Firefox Password Manager
- Edit or delete a login in Firefox Lockwise
- Edit or delete a login in Firefox Lockwise on desktop
- Edit or delete a login with the Firefox Password Manager
- Edit top sites on Firefox Lite home screen
- Email notifications and inbox sync
- Enable AI chatbots in Firefox
- Enable and disable cookies that websites use to track your preferences
- Enable auto-fill on your Android devices
- Enable auto-fill on your iPhone or iPad