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- Control audio or video playback with your keyboard
- Control cellular and data connections and settings on Firefox OS
- Control Center - manage site privacy and security controls
- Controlling AVG Firefox add-ons
- Control notifications in Firefox for Android
- Control screen brightness
- Control screen brightness on Firefox OS
- Control whether Firefox automatically fills in forms
- Control whether Firefox automatically fills in forms with your information
- Conversocial - Escalation process
- Conversocial Escalation process
- Conversocial tagging guidelines
- Conversocial - Tagging guidelines
- Cookies
- Cookies - Information that websites store on your computer
- Copy a saved password in Firefox for Android
- Copy text from images on Firefox for MacOS
- Could not initialize the browser security component
- Crashes involving STOPzilla
- Crashes on startup after the update to Firefox 46 on OS X
- Crash on Broadwell-U with old microcode
- Crash Report E-mail FAQ
- Crash Report E-mail FAQ Redirect 1
- Crash reporting Firefox Reality
- Crash reporting in Firefox Reality
- Crash signature - 0x0
- Crash signature - arena_run_reg_alloc
- Crash signature - _eFOGetName
- Crash signature - GraphWalker::DoWalk
- Crash signature - js_FinishSharingTitle
- Crash signature - js_Interpret
- Crash signature - js_LockGCThingRT
- Crash signature - js_TraceObject
- Crash signature - KiFastSystemCallRet
- Crash signature - memcpy fillInCell
- Crash signature - memmove
- Crash signature - nsCycleCollectingAutoRefCnt decr nsISupports
- Crash signature - nsEventListenerManager Release
- Crash signature - nsGlobalWindow cycleCollection UnmarkPurple nsISupports
- Crash signature - NSSRWLock_LockRead_Util
- Crash signature - nsStyleSet AddImportantRules
- Crash signature - nsStyleSet FileRules
- Crash signature - nsWindow GetParentWindow
- Crash signature - PL_DHashTableOperate
- Crash signature - _PR_MD_SEND
- Crash signature - RaiseException
- Crash signature - RtlFreeHeap
- Crash signature - RtlpCoalesceFreeBlocks or RtlAllocateHeap
- Crash signature - RtlpWaitForCriticalSection
- Crash signature - RtlpWaitOnCriticalSection
- Crash when closing a Gmail tab
- Create a desktop shortcut to a website
- Create and manage your contacts list on Firefox Hello
- Create an email alias through Firefox Relay
- Create an email mask through Firefox Relay
- Create a new Knowledge Base article
- Create a Wi-FI Hotspot on Firefox OS
- Create bookmarks to save your favorite webpages
- Create or improve common forum responses
- Create secure passwords to keep your identity safe
- Create Tutorial using the Knowledge Base Popup Tutorial Template
- Creating a desktop shortcut to a web page
- Creating a new event or task
- Creating a Newsgroup Account
- Creating a recurring event
- Creating Articles
- Creating New Calendars
- Customer Service Contributor Forum Skills
- Custom installation of Firefox on Windows
- Custom installation of Firefox on Windows Redirect 1
- Custom installation of Thunderbird on Windows
- Customize content on the Firefox Homepage
- Customize controls and options for Firefox OS phones
- Customize controls and options on Firefox OS
- Customize controls and options on you Firefox OS phone
- Customize Date and Time formats in Thunderbird
- Customize Firefox
- Customize Firefox controls, buttons and toolbars
- Customize Firefox Home on iOS
- 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
- 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