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- Customize Firefox using AutoConfig
- Customize Firefox using Group Policy (Windows)
- Customize Firefox using policies.json
- Customize Firefox with add-ons, plugins and extensions
- Customize Firefox with MSI installers
- Customize items on your Firefox New Tab page
- Customize navigation buttons like back, home, bookmarks and reload
- Customize privacy and security settings
- Customize Shortcuts on your New Tab page
- Customize sound and vibration settings on Firefox OS
- Customize the Firefox Homepage
- Customize the Firefox home screen
- Customize the New Tab page
- Customize your Firefox Home content
- Customize your Firefox New Tab page
- Customize your Firefox Preview homepage
- Customize your New Tab page
- Customize your New Tab page to hide or display content
- Customize your wallpapers
- Customizing Firefox
- Customizing Firefox on MacOS using configuration profiles
- Customizing Firefox Using AutoConfig
- Customizing Firefox Using Group Policy
- Customizing Firefox Using Group Policy (Windows)
- Customizing Firefox Using policies.json
- Customizing Firefox with add-ons
- Customizing the Start Page
- Customizing your reading experience in Pocket Premium
- Customizing your reading settings in Pocket
- Dangerous directories
- Data broker scan
- Data broker sites
- Data Loss Prevention
- Data Removal Pilot -How do I change my personal information?
- Debugging Firefox Private Network VPN
- Debugging Mozilla VPN
- Debugging policy issues
- Deceased or incapacitated account management FAQ
- Dedicated profile per Thunderbird installation
- Dedicated profiles per Firefox installation
- Delete an email mask
- Delete an individual tab in Firefox Focus for Android
- Delete an individual tab in Firefox Klar for Android
- 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
- Deleting the DigiNotar CA cert
- Deleting the DigiNotar CA certificate
- Deleting the DigiNotar CA cert TB
- Deleting Your Pocket account
- 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
- Desktop home for mobile - Common Questions
- Diagnose Firefox issues using Troubleshoot Mode
- Different ways to access PDF files with Firefox
- Difficulties opening or using a website in Firefox 100
- Difficulties opening or using a website in Firefox Focus for Android 100
- Difficulties opening or using a website in Firefox for Android 100
- Difficulties with a website in Firefox Focus for Android 100
- Difficulties with a website in Firefox Klar for Android 100
- 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 Firefox Sync on a lost phone or tablet
- Disable high contrast mode in Firefox
- 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
- Disable VPN protection for a specific website
- Disabling the included version of Pocket and toolbar button
- Disabling the included version of Pocket and toolbar button Redirect 1