Fix slowness, crashing, error messages and other problems
- Fix problems with websites (Facebook, YouTube, webmail etc.)
- Unblock Firefox from connecting to the Internet
- Procedures to diagnose and fix problems
- Videos, sound, pictures and animations don't work
- Firefox is slow or stops working Slowness or hanging
- Firefox crashes Crashing
- Firefox won't save settings or remember information
- Problems with add-ons, plugins or unwanted software
In English
- Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work?
- How to troubleshoot time related errors on secure websites
- Avoid and report Mozilla tech support scams
- Refresh Firefox - reset add-ons and settings
- Certificate Pinning Reports
- How to troubleshoot "Your connection is not secure" error codes on secure websites
- Use the Troubleshooting Information page to help fix Firefox issues
- Firefox Health Report - understand your browser performance
- How to reset the default user agent on Firefox
- What do the SSLv3 error messages mean on Firefox?
- Rate your Firefox experience (Heartbeat)
- Norton Toolbar won't work with Firefox version 41
- Lastpass was disabled after updating Firefox
- Accessibility not available during multi-process support
- My Mac won't shut down after updating to Firefox version 45
- Re-enable multi-process support disabled by Windows utilities
- Allow Firefox to load multiple tabs in the background
- Hardware acceleration and WindowBlinds causes Firefox to crash
- Old versions of Websense cause startup crashes in Firefox
- Streaks, smeared lines or blurry web pages while scrolling on Firefox
- 64-bit Firefox crashes with Citrix's XenApp VM
- Firefox crashes on startup for users of Comodo security products after July 2017 Windows 10 update
- Firefox startup crash with G DATA security software
- Firefox crashes - Troubleshoot, prevent and get help fixing crashes
- What to do when searches take you to the wrong search website
- Firefox is stuck in Safe Mode
- Firefox repeatedly opens empty tabs or windows after you click on a link
- Reset your Master Password if you've forgotten it
- Fix video and audio playback problems on Firefox for Windows
- Avoid crashes - Tips and tricks
- Fix printing problems in Firefox
- Problems with email and how to find help
- Firefox keeps crashing at startup
- Wrong home page opens when I start Firefox - How to fix
- How do I submit a bug for Firefox sync?
- Home page with pipe character opens extra tabs when Firefox starts
- Can't add, change or save bookmarks - How to fix
- How to run Firefox when your profile is missing or inaccessible