How to troubleshoot Firefox High CPU Usage Error on Windows PC

  • High CPU usage can cause systems with Windows 10 to slow down, freeze, or hang.
  • High CPU or memory utilization can be caused by many applications and processes.
  • If there are problems with your current Firefox profile, you should delete your current profile and create a new one to solve the high CPU usage problem.
  • If you recently installed any new add-ons, uninstalling them to see if they are causing the problem.
  • You can see if Firefox is running with fewer resources.

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Firefox Using A Lot Of Memory

Multiple tabs open in a browser are most commonly responsible for memory consumption.

Memory Leaks Firefox

It is likely that you are familiar with the Firefox memory leak error if you frequently use it. Firefox uses a lot of memory because it contains resource-consuming extensions. It can also cause the error if you use too many tabs or use an outdated version.

This article presents some options for managing Firefox’s resource usage when it starts consuming significantly more resources than usual during long periods of sustained use.

Several applications and processes can cause the CPU to be overloaded, slow, or hang if it is overloaded. Several applications and processes can cause this high CPU usage. This article will help you if you are experiencing high CPU load due to Firefox.

What causes Firefox to have a high CPU load?

Firefox Memory Leak

There is a large memory leak when someone in the room shares their screen or camera. If any person shares their screen or camera in the room, then anyone else that is in the room and running Firefox on PC will experience an instant memory leak at a rate of about 50MBs per second. It will continue to leak till the PC hits the 100% Memory limit and the Room screen will go black, then a few seconds later Firefox will crash. Or the Windows screen will go black. once Firefox is closed, the memory is released.

Start Firefox in Troubleshoot Mode and observe the amount of memory and CPU used by an extension or theme to determine if it is using too many resources. If you notice a significant improvement when in Troubleshoot Mode, you can disable or uninstall extensions if you notice a significant improvement.

A workaround for this is to periodically restart Firefox. If Firefox is left open for an extended period of time, it will use a lot of system resources. For more information, see Restore previous session – Configure when Firefox shows your most recent tabs and windows. You can configure Firefox to save your tabs and windows so that you can start where you left off when you restart it.

Graphics Driver: This problem is often related to graphics and is closely related to the graphics driver installed on your computer.

Suspicious add-ons: If you recently installed any new add-ons, you should consider uninstalling them to see if they are causing the high CPU load problem.

Current Profile Problems: If there are problems with your current Firefox profile, you should delete your current profile and create a new one to solve the high CPU usage problem.

How to solve the problem of high CPU usage in Firefox?

Updated: December 2023

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In addition to fixing many issues, the Refresh Firefox feature can save your essential information. For more information, please see Refresh Firefox – reset add-ons and settings.

As a result, my computer was randomly freezing and locking up with Firefox. It took a reboot to restore it to normal. I eventually gave up on FF and switched to Chrome.

Perform Firefox in Troubleshooting mode

  1. Firefox will open its menu.
  2. Troubleshooting mode can be found by clicking Help – > Troubleshooting.
  3. You will see a pop-up window asking you to restart. Click on Restart.

Your extensions, themes, and configurations will be removed from Firefox when you restart. If Firefox is running with fewer resources, it could be caused by an extension or theme.

Turn on hardware acceleration

  1. Open the Firefox menu with administrative privileges and go to Preferences.
  2. Go to the General menu on the left.
  3. The Use Recommended Performance Options option can be turned off by scrolling down to the Performance section.
  4. If available, enable Hardware acceleration.

Change the limit of the content process

  1. Click the Preferences button in Firefox’s menu.
  2. Under General, select Performance.
  3. Select the option that disables the use of recommended performance settings.
  4. Set the number of content processes available to a new lower value by using the drop-down menu next to Content Process Limit.
  5. Firefox should be restarted.

Deleting a saved profile file

  1. The Firefox menu should be opened and then additional troubleshooting information should be selected.
  2. Click the Open Folder button next to the profile folder under App Basics.
  3. The content-prefs.sqlite file should be deleted completely.
  4. Firefox should be restarted.

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Frequently Asked Questions

Firefox browser's high CPU usage is mainly due to parsing heavy site elements and background processes. This can be solved by optimizing your browser configuration and not using many third-party add-ons that run in the background.

  1. Turn off unnecessary processes.
  2. Defragmenting the hard drives of affected computers regularly.
  3. Do not run too many programs at the same time.
  4. Uninstall all programs that you do not use from your computer.

Firefox has a built-in tool for viewing memory reports and saving logs. It allows you to clean up memory and minimize memory usage. Type about:memory in the address bar and press Enter or Return. Find the Free memory field and select Minimize memory usage.

  1. Update Firefox.
  2. Run Firefox in Troubleshooting mode.
  3. Turn on Firefox's strict mode.
  4. Turn on hardware acceleration.
  5. Use Firefox tools.
  6. Change the limit of content processing.
  7. Delete the saved profile file.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.