Troubleshoot and diagnose Firefox problems

 Most problems with Firefox can be fixed by following the troubleshooting methods described below. Try these steps in order. If one doesn't work, move on to the next one. If you need extra help with any of this, we have Mozilla Firefox Help

1. Restart your computer

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

2. Clear your cookies and cache

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

  1. Click the Library button  on your toolbar. (If you don't see it there, click the menu button  then click Library.) Click History and select Clear Recent History….
  2. In the Time Range to clear: drop-down, select Everything.
  3. Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
  4. Click Clear Now.

For more information, see Delete browsing, search and download history on Firefox.

3. Restart Firefox in Safe Mode

Firefox Safe Mode is a troubleshooting mode that disables extensions, uses the default theme, turns off hardware acceleration and uses default toolbar settings, among other changes (see this article for details). To start Firefox in Safe Mode:

  1. Click the menu button Fx57menu, click Help, select Restart With Add-ons Disabled… and click Restart in the Restart With Add-ons Disabled dialog.
    Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.
  2. In the next Firefox Safe Mode dialog, click Start in Safe Mode.
  3. Check whether your problem is still happening while in Safe Mode.
  • If the problem still happens in Safe Mode, go on to step 4.
  • If the problem does not happen in Safe Mode, follow these instructions to troubleshoot extensions, themes and hardware acceleration.

4. 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.

  1. Download and save the installer for the latest official version of Firefox from mozilla.org.
  2. Exit Firefox (if open): Click the Firefox menu Fx57Menu and select Exit.
  3. You may want to make a note of the Mozilla Firefox program folder location (right-click the Firefox desktop icon, select Properties from the context menu and click the Shortcut tab) since there may be leftover files and folders after you uninstall Firefox that should be removed for a clean reinstallation.
  4. Uninstall Firefox from your computer.
  5. Delete the Firefox program folder, which is normally found in one of these locations by default:
    • C:\Program Files\Mozilla Firefox
    • C:\Program Files (x86)\Mozilla Firefox
  6. Reinstall Firefox using the installer you downloaded earlier - see How to download and install Firefox on Windows for instructions.

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

5. Refresh Firefox

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

  1. Click this Refresh Firefox button directly, if you are viewing this page in Firefox. This won't work if you are using a different browser or a mobile device.
    • You can also find a Refresh Firefox button at the top of the Firefox about:support Troubleshooting Information page.
  2. To continue, click Refresh Firefox in the confirmation window that opens.
  3. Firefox will close to refresh itself. When finished, a window will list your imported information. Click Finish and Firefox will open.

6.  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 the Profile Manager - Create, remove, or switch Firefox profiles article for instructions.

Other solutions

If you've tried all of these troubleshooting methods, and you're still having problems, here are some other solutions you can try:

Check browser internals

The Firefox Task Manager (about:performance page) lets you see what tabs or extensions are slowing down Firefox. Telemetry Data shared with Mozilla (about:telemetry page) contains detailed data about performance, hardware, usage and customization. The Troubleshooting Information page (about:support page) includes other about: page links and troubleshooting resources. (For a list of all about: pages, enter about:about in the address bar.)


                     Call  1-856-514-8666 for help and support of Mozilla Firefox Help.



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