Diagnose Firefox issues using Troubleshoot Mode

Troubleshoot Mode is a special Firefox mode that can be used to diagnose and fix problems. When you start Firefox in Troubleshoot Mode, it temporarily disables add-ons (extensions and themes), turns off hardware acceleration and certain other features, and ignores some customizations (see below to learn more). Comparing Firefox's behavior in normal mode to its behavior in Troubleshoot Mode may help pinpoint the cause of the problem. Fix Firefox Error

How to start Firefox in Troubleshoot Mode

Click the menu button Fx57menu, click Help, select Troubleshoot Mode… and click Restart in the Restart Firefox in Troubleshoot Mode? dialog.

Troubleshoot Mode window

You will have two options:

  • Clicking the Open button will start Firefox with the default theme, your extensions will be disabled, and some other features and customizations will be turned off. These changes are temporary. When you leave Troubleshoot Mode and start Firefox normally, your add-ons and other settings will return to the state they were in before you entered Troubleshoot Mode.
  • Clicking the Refresh Firefox button will restore Firefox to its factory default state while saving your essential information. These changes are permanent. See Refresh Firefox - reset add-ons and settings for more information, before you choose this option.

Diagnosing problems in Troubleshoot Mode

After you start Firefox in Troubleshoot Mode, you'll want to test its behavior and see if the problem goes away.

The problem happens in Troubleshoot Mode

If the problem still happens in Troubleshoot Mode, it is not being caused by an extension or theme. Other possible causes include changes made to Firefox preference settings, which are not disabled in Troubleshoot Mode. See the following articles for solutions:

The problem does not happen in Troubleshoot Mode

If the problem does not happen in Troubleshoot Mode, the most likely cause is an extension, theme or hardware acceleration. See this article for solutions:

Exiting Troubleshoot Mode

  1. Click the Firefox menu Fx57Menu and select Exit.
  2. Start Firefox as you normally would.
    • If Firefox keeps starting in Troubleshoot Mode, see Firefox is stuck in Troubleshoot Mode.

More information (Advanced users)

In addition to disabling add-ons (extensions and themes) and turning off hardware acceleration, Firefox Troubleshoot Mode disables Enhanced Tracking Protection and Safe Browsing features. Firefox Troubleshoot Mode also disables the JavaScript Just-in-time (JIT) compiler and ignores the optional userContent.css and userChrome.css files (if present). The xulstore.json file, which saves customizations to window sizes, toolbar settings and controls, is also ignored; however, any changes stored in modified preferences remain in effect.


                      Call  1-856-514-8666 for help and support of Fix Firefox Error.


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