Reset Firefox preferences to troubleshoot and fix problems

Revision Information
  • Revision id: 24367
  • Created:
  • Creator: Tonnes
  • Comment: typo
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: Verdi
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: No
Revision Source
Revision Content

When troubleshooting Firefox problems, resetting preferences (zoom, tabs, privacy, network, encryption, download actions, etc.) is one of many procedures that can be helpful in pinpointing the issue. This article explains how to use Troubleshoot Firefox issues using Safe Mode to reset preferences.

Note: The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. This resets many more things than just your preferences. Consider using it before going through a lengthy troubleshooting process.

To reset preferences: Click the menu button New Fx Menu , click help Help-29 and select Restart with Add-ons Disabled.... Firefox will start up with the Firefox Safe Mode dialog.

Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)

  1. Click to put a check mark by Reset all user preferences to Firefox defaults.


  2. To apply your changes, click Make Changes and Restart.

Firefox will restart with your preference settings changed back to the defaults.