How to
- Change your theme in Firefox Focus for iOS
- Change your theme in Firefox Klar for Android
- Change your theme in Firefox Klar for iOS
- Change your wallpaper in Firefox for Android
- Change your wallpaper in Firefox for iOS
- Changing calendar preferences
- Changing fonts and colors
- Changing IMAP to POP
- Changing the Date or Time of an Event
- Changing the e-mail program used by Firefox
- Changing Your language in Pocket
- Changing your two-step authentication device for your Firefox Account
- Changing your two-step authentication device for your Mozilla account
- Check the battery level
- Check your mobile broadband coverage
- Choose a Firefox update channel
- Choose a strong password
- Choose display languages for multilingual web pages
- Choose the Mozilla VPN plan that is right for you
- Choose your opening screen for Firefox for iOS
- Choose your preferred PDF viewer in Firefox
- Choosing a Firefox CPU architecture for Windows OS
- Choosing a Firefox update channel
- Choosing More Secure Passwords
- Clear browsing history and cookies
- Clear Browsing History, Cookies and Stored Data on Firefox OS
- Clear browsing history from Firefox Lite
- Clear browsing history in Firefox for iOS
- Clear cookies and cache in Firefox
- Clear cookies and site data in Firefox
- Clear cookies and site data in Firefox for Fire TV
- Clear cookies and website data for a single domain in Firefox for Android
- Clearing cookies, private data, history, and settings in Firefox for Android
- Clearing Location bar history
- Clearing private data
- Clear my cookies on Firefox for Echo Show
- Clear notifications on Firefox OS
- Clear private data or browsing history on Firefox for Android
- Clear Recent History
- Clear recent searches from the Search bar
- Clear the cache - Delete temporary Internet files to fix common website issues
- Clear your browsing history and other personal data on Firefox for Android
- Clear your browsing history and other personal data on Firefox for Android Redirect 1
- Clear your browsing history in Firefox for Android
- Clear your cache and other personal data on Firefox for Android
- Clear your cache without clearing your browsing history
- Clear your search history in Firefox for Android
- Clear your search history in Firefox Search
- Cliqz Recommendations in Firefox
- Closing multiple Tabs - option to disable warning
- Collections in Firefox
- Collections in Firefox Preview
- Collections in Firefox Redirect 1
- Common Myths about Private Browsing
- Common Voice Accounts - Managing Account Data
- Compact Inbox or Other Folder
- Compacting folders
- Compact mode workaround in Firefox
- Compact tabs - make your tabs smaller
- Compose an email from the Contacts app
- Composing and Sending Email
- Composing and Sending Email on Firefox OS
- Composing an email from Contacts
- Config Editor
- Config Editor for Thunderbird
- Configuration Editor for Firefox
- Configuration Editor for Firefox Redirect 1
- Configuration Options for Accounts
- Configuration Options for Add-ons
- Configuration Options for Attachments
- Configuration Options for Certificates
- Configuration Options for Character Encoding
- Configuration Options for Downloading Messages
- Configuration Options for Filtering Messages
- Configuration Options for Folders
- Configuration Options for Identity
- Configuration Options for Receiving Messages
- Configuration Options for Search
- Configuration Options for Security
- Configuration Options for Sending Messages
- Configuration Options for Startup
- Configuration Options for System
- Configuration Options for Tags
- Configuration Options for Updates
- Configuration Options for Viewing Messages
- Configuration Options for Writing Messages
- Configure an account
- Configure DNS over HTTPS protection levels in Firefox
- Configure firewalls so that Firefox can access the Internet
- Configure mobile privacy and security settings
- Configure Norton 360 to work with Firefox
- Configure Origin Address for Multiple Gmail Accounts
- Configure push email for Thunderbird for Android
- Configure Windows Firewall to allow Firefox access to the Internet
- Configuring AVG Internet Security
- Configuring BitDefender Internet Security
- Configuring CA Internet Security Suite
- Configuring Certificates
- Configuring Comodo Firewall Pro
- Configuring Comodo Internet Security