How to Troubleshoot and diagnose Firefox problems

10. February 2017 Software 0

Many problems with Firefox are caused by faulty extensions or themes, incorrect settings, or corrupt files. If Firefox does not work properly (or not at all), don’t panic! This step-by-step guide will help you troubleshoot problems with Firefox.

Troubleshoot and diagnose Firefox problems

Restart your computer

Sometimes problems can be fixed by simply restarting your computer and then starting Firefox again.

Clear your cookies and cache

Many problems with loading web pages can be resolved by clearing Firefox’s cookies and cache:

  • Click the menu button New Fx Menu , choose History and select Clear Recent History….
  • In the Time Range to clear: drop-down, select Everything.
  • Click the arrow next to Details to display the list of items that can be cleared.
  • Select both Cookies and Cache.
  • Click Clear Now.

Restart Firefox in Safe Mode

Firefox Safe Mode is a troubleshooting mode that disables all extensions, uses the default theme, turns off hardware acceleration, and uses default toolbar settings and controls, among other things. To start Firefox in Safe Mode:

  • 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.
  • In the Firefox Safe Mode dialog, click Start in Safe Mode.
  • Check whether your problem is still happening while in Safe Mode.

Reinstall Firefox

Some Firefox issues can be caused by a problem with one of the Firefox program files. Follow these steps to completely remove and reinstall Firefox. This process will not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.

  • Download the latest official version of Firefox from
  • Exit Firefox: Click the menu button New Fx Menu and then click Exit Close 29 .
  • Uninstall Firefox from your computer.
  • Delete the Firefox program folder, which is located in one of these locations by default:
  1. C:\Program Files\Mozilla Firefox
  2. C:\Program Files (x86)\Mozilla Firefox

Now start Firefox and check to see if your problem has been fixed. If it hasn’t, continue with the next troubleshooting method.

Refresh Firefox

The Refresh Firefox feature can fix many issues by restoring your Firefox profile to its default state while saving your essential information.

  • Click the menu button New Fx Menu and then click help Help-29 .
  • From the Help menu choose Troubleshooting Information.
  • Click the Refresh Firefox button in the upper-right corner of the Troubleshooting Information page.

Troubleshoot and diagnose Firefox problems

  • To continue, click Refresh Firefox in the confirmation window that opens.
  • Firefox will close to refresh itself. When finished, a window will list your imported information. Click Finish and Firefox will open.

Create a new Firefox profile

Sometimes files in your Firefox profile folder that correspond to the essential information that a Firefox Refresh doesn’t remove (such as bookmarks and browsing history) may be causing the issue. You can create a new, additional profile which will not contain any of your old Firefox data. See Use the Profile Manager to create and remove Firefox profiles for instructions.



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