Use the Troubleshooting Information page to help fix Firefox issues

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Firefox includes a page with information such as which Firefox version you are using, any installed extensions, important modified preferences, and graphics information. If you are getting help with a Firefox issue on the support forum, content that you provide from this Troubleshooting Information page can help you get your issue solved quickly.

This article describes how to access and use the Troubleshooting Information page.

Accessing the Troubleshooting Information page

Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information.

You will be taken to a page with the address about:support.

Fx40aboutsupport Fx38aboutsupportWin7 TroubleshootingInfo-Fx35 troubleshooting 33 aboutsupport-Fx29Fx30

Reset Firefox

Give Firefox a tune up

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process.

The Refresh Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process.

Try Safe Mode

You can restart Firefox in Safe Mode to temporarily turn off hardware acceleration, reset some settings, and disable add-ons (extensions and themes) that might be causing problems. See Troubleshoot Firefox issues using Safe Mode for more information.

Copy to clipboard

Clicking on the Copy text to clipboard button will copy all the text on the page to the Windows clipboardMac clipboardclipboard.

After copying, you can paste the information into another window for someone to see by clicking the Edit menu in the program you are using and then selecting Paste (or by holding down the Ctrlcommand key and pressingV).

Application Basics

  • Name: Tells you the name of the product you are using. In most cases, it should say "Firefox".
  • Version: Tells you which version number of Firefox you are using.
  • Update History:Clicking on Show Update History will open a window showing a history of Firefox updates that have been installed.
  • User Agent: In addition to your browser and its version number, the User Agent provides other details about your system, such as the operating system and version.
  • Enabled Plugins: Plugins are Firefox add-ons that manage internet content that Firefox is not designed to process. These usually include patented formats for video, audio, online games, presentations, and more. Clicking on about:plugins will take you to a page that lists all of your installed plugins, their version numbers, and the type of internet content each plugin is registered to handle. For more information, see Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems.
  • Build Configuration: Clicking on about:buildconfig will take you to a page that will help someone understand if you are using a standard version of Firefox or a custom version.
  • Memory Use: Clicking on about:memory will take you to a page that shows memory usage. For more information, see this blog post.
  • Registered Service Workers: Clicking on about:serviceworkers will show you whether or not the Service Workers feature is enabled and if any current Worker URLs are registered. Service workers are used for web enhancements such as push notifications.
  • Multiprocess Windows: This shows you the number of Multiprocess Firefox windows (if any) and the total number of windows that are open.

Crash Reports for the Last 3 Days

This section lists crash Report IDs, if any, submitted by the Mozilla Crash Reporter during the last three days. Clicking on one of the Report ID links will take you to a webpage with details about that crash. Clicking on the All Crash Reports link will take you to the about:crashes page listing all submitted crash reports. To get help with crashes, see Firefox crashes - Troubleshoot, prevent and get help fixing crashes.


Extensions are Firefox add-ons that provide additional functionality to Firefox. They are installed separately, and are usually installed by you. This section lists the name of each extension you have installed, its version, whether it is enabled, and its ID string. It is particularly useful in cases where an extension is the cause of a problem in Firefox. For more information, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.


Firefox can use your computer's graphics processor to speed up display of some pages with video and animation, which is called hardware acceleration, and to display WebGL content. This section provides information about your computer's graphics device and driver and will tell you whether hardware acceleration and WebGL are enabled or not in Firefox. Note that graphics features may be disabled because of outdated graphics drivers. For help updating your graphics drivers, see Upgrade your graphics drivers to use hardware acceleration and WebGL

Important Modified Preferences

In this section, you will see a list of settings that have been changed from their defaults. This information will help someone know how you have adjusted your installation of Firefox. For instructions on how to reset preferences to default, see Reset Firefox preferences to troubleshoot and fix problems.


This section displays some JavaScript settings that can impact your browsing performance.


This section shows if you have accessibility software enabled in Firefox.

Library Versions

This section tells you which versions of some runtime libraries are used.

Experimental Features

This section has details about current or past telemetry experiments, if any, that you've been part of. For more information about Telemetry, see the article Share telemetry data with Mozilla to help improve Firefox.

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