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.

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Give Firefox a tune up

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 the text on the page to the Windows clipboardMac clipboardclipboard. (For privacy reasons, the Application Basics Profile FolderProfile Directory line will not be copied.)

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.
  • Profile Folder: Your profile folder is a location on your computer where Firefox stores your personal information such as bookmarks, passwords, and user preferences. Clicking on Show FolderOpen FolderShow in Finder will take you to your profile folder, where you can manage your files. For more information, see Profiles - Where Firefox stores your bookmarks, passwords and other user data.
  • Enabled Plugins: Clicking on about:plugins will take you to a page that lists your installed plugins. For more information, see Watch DRM content on Firefox and Use plugins to play audio, video, games and more.
  • 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.
  • Safe Mode: This tells you whether or not Firefox is currently in Safe Mode.
  • Profiles: Clicking on about:profiles will take you to a page still in development that will replace the Profile Manager.

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 web page 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.

Firefox Features

Some features included in Firefox, such as Pocket and Firefox Screenshots, are installed as extensions so that they can be updated separately from Firefox. These extensions (sometimes called system add-ons) are not listed in the Add-ons Manager.


Extensions are Firefox add-ons that provide additional functionality to Firefox. This section lists the name of each extension, its version, whether it is enabled, and its ID string. For more information about troubleshooting extensions you have installed, see the article Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

Note: Some add-ons will be listed here but not in the Add-ons Manager, such as Pocket. They are features included in Firefox that are installed as extensions, so they can be updated separately from Firefox.

Security Software

This section displays information about the security software installed on your computer. This includes most antivirus and antispyware software, as well as your firewall. Not having security software installed on your system can leave your system vulnerable. For more information about troubleshooting issues that may be caused by malware, see the article Troubleshoot Firefox issues caused by malware.


Firefox can use your computer's graphics processor to speed up the 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.


This section displays information about your system audio. The displayed information will include your operating system's preferred audio settings, as well as the audio input (such as microphones) and output (such as speakers or headphones) devices. From here you can also see the state of each device and some information about the audio format settings. For more information on fixing audio issues in Firefox, see the article What to do if Firefox won't play any sounds.

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.

Important Locked Preferences

In Firefox, it's possible to lock certain preferences so that they cannot be changed by the end user. This is common in enterprise environments. For more information about locking preferences, see the Customizing Firefox Using AutoConfig documentation.

Places Database

Firefox periodically performs maintenance tasks on your bookmarks and history database (also known as Places database). Use the Verify Integrity button to perform those tasks on-demand. If you're having any problems with bookmarks and history, the Verify Integrity tool might help.


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 data with Mozilla to help improve Firefox.


For security and performance purposes, Mozilla created Project Electrolysis (often referred to as e10s) to implement a practice called sandboxing into Firefox. This ensures that web content is run in a seperate process from the main Firefox program. This section of the troubleshooting information shows details about the sandbox security levels. See the Sandbox page on the Mozilla Wiki for more information on sandboxing in Firefox.

Internationalization & Localization

This section shows information about the language and regional preferences in Firefox and your operating system. For information about using Firefox language packs, see the article Use the Firefox interface in other languages with language packs.

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