FIX high CPU usage from Firefox on Windows 10/11. – wintips.org

If Firefox is causing high CPU usage on your computer, continue reading below to resolve the issue. Firefox has long been considered a very good and secure web browser. It also comes with many useful features that generally suit users who want to enjoy a smooth viewing experience.

However, users have noticed that Firefox uses more CPU power than usual. This problem is usually caused by problems with the user profile, unwanted add-ons, and problems with the browser itself. Below we list some effective solutions that will solve the problem.

How to reduce high CPU or memory usage of Firefox on Windows 11/10.

1. Restart Firefox and refresh.

2. Run Firefox in troubleshooting mode.

3. Remove unnecessary extensions from Firefox.

4. Reduce the content process limit

5. Disable Hardware Acceleration.

6. Delete Firefox preference files.

7. Update Firefox.

8. Create a new user profile.

9. Uninstall and reinstall Firefox.

10. Other solutions.

Method 1. Restart Firefox and update.

If you notice that your current Firefox session is causing high CPU usage, you should first restart Firefox. Usually, when Firefox stays open for a long time, it consumes more system resources and this causes problems.

After restarting, make sure that you only open a limited number of tabs, because when you open a large number of tabs, it can cause Firefox to use more system resources, which can cause high CPU and memory usage problems.

Finally, go ahead and Update Firefox to its version, follow these steps:

1. From Firefox menu image go to help me > About Firefox.

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2. After making sure you have the latest version of Firefox, check if the high CPU usage issue is resolved, and if not, continue with the method below.

Update Firefox

Method 2. Run Firefox in troubleshooting mode.

Firefox’s troubleshooting feature lets you open Firefox with all extensions and customizations turned off, so you can determine if they’re causing the problem. To open Firefox in troubleshooting mode:

1. press and hold SHIFT key and then double click In the Firefox app.

2. press It’s open To run Firefox in troubleshooting mode.

Firefox troubleshooting mode

3. Check if the high CPU/Memory usage problem persists in the troubleshooting mode and depending on the result:

  • If the problem does not occur in the troubleshooting mode, then a plugin or extension is causing the problem. In this case, continue Method-3 below.

  • If you encounter a problem in troubleshooting modekeep going Method-4.

Method 3. Remove or remove unnecessary plugins from Firefox.

Because installed Firefox add-ons and extensions can cause high CPU or memory usage, disable or remove them and see if the problem persists.

1. From Firefox menu image press Supplements and topics.

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2. Choose Extensions on the left and then uninstall any suspicious extensions that may be causing Firefox’s high CPU usage problem. three points next to them and choose Turn off.

Remove Firefox extensions

3. Next, go Plugins and turn off any plugin you don’t need. *

*Note: I suggest not to delete the “OpenH264 Video Codec” and “Widevine Content Descriptor” add-ons, because they are automatically installed by Mozilla in the Firefox browser.

  • The OpenH264 plugin allows video calls.
  • The Widevine Content Description module is used by sites to allow content review.

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4. When done, close and reopen Firefox to see if the issue is resolved.

Method 4. Reduce the content processing limit in Firefox.

1. From Firefox menu image choose Settings.

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2. Yes General oscroll down the options Work settings and remove the mark the Use the recommended performance settings.

3. Then, reduce Content process limit (eg to “5” or to “2”) *

*Note: If there is no Content Processing Limit option here, enter it about: config in the address bar and then decrease The dom.ipc.processCount value.

Firefox Content Processing Limit

4. Now restart Check if Firefox and high CPU usage problem persists.

Method 5. Disable hardware acceleration in Firefox.

1. From Firefox menu image choose Settings.

2. Yes General oscroll down the options Work settings and remove the mark the Use the recommended performance settings.

3. Then remove the mark the Use hardware acceleration when available check the box. *

*Note: If hardware acceleration is already disabled, enable it.

Disable Firefox Hardware Acceleration

4. Now restart Go to Firefox and check if the CPU usage is reduced.

Method 6. Delete Firefox preference files.

Another way to reduce the problem of high CPU usage caused by Firefox is to delete Firefox’s preference files.

1. From Firefox menu imagego to help me > More troubleshooting information.

FIX high CPU usage from Firefox on Windows 10/11.

2. click on Open the profile folder.

FIX high memory usage from Firefox

3. Find and turn off the following two files:

    1. content-prefs.sqlite
    2. prefs.js

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4. Now near and Open Firefox again.

Method 7. Fix Firefox’s high CPU usage by updating Firefox.

The next way to solve problems with high CPU and memory usage in Firefox is to update it to the default state when saving important data. This solution restores the settings, but also removes other settings in Firefox, including added extensions and themes.

1. press and hold SHIFT key and then double click In the Firefox app.

2. press Update To reset Firefox to its default state.

Firefox will be reset to default

3. press Update Firefox continue.

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4. After the reset, Firefox will open again in a clean state. Open multiple tabs and visit multiple websites to check if the high CPU issue is resolved.

Method 8. Create a new user profile in Firefox.

1. click on Windows + R buttons to open Running dialog box.

2. In the window that opens, paste the following command and click Enter to open Firefox profile manager.

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3. In the Select User Profile window, click Create a profile.

Create a new Firefox profile

4. press The next one and then enter a name for the new profile and click Termination.

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5. Now select the new profile and click on it Start Firefox.

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6. Now check if the problem persists with the new profile and if not, close Firefox, move your bookmarks and passwords from the OLD profile to the NEW and then reopen the Firefox profile manager using steps 1 and 2 above and turn off OLD profile.

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Method 9. Completely uninstall and reinstall Firefox.

1. click on Windows + R buttons to open Running dialog box.

2. In the window that opens, paste the following command and click Enter:

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3. select Mozilla Firefox and press Delete.

Disable Firefox

4. Once Firefox is uninstalled, go ahead and remove the Mozilla Firefox folder from the following two locations:

  • C:\Program Files\Mozilla Firefox
  • C:\Program Files (x86)\Mozilla Firefox

5. After removal, restart your personal computer.

6. Using another web browser (eg Edge, Chrome), go to the Mozilla download page download it and installation The latest version of Firefox.

Other Solutions to Fix Firefox High CPU Usage Issues

If you’re still having performance issues with Firefox after following the methods above, here are some other solutions you can try:

1. Use Firefox Task Manager to find out which tabs or extensions are slowing down Firefox and stop them. For this:

  1. Open a new tab in Firefox and type in the address bar: about: performance

  2. Then look Energy Impact* and Memory** Tabs to identify which extension or page is causing the problem.

* Energy effects Shows the processing power used by the CPU. Power-intensive tasks can slow down your system.

** Memory shows the amount of RAM used by currently running tasks.

Firefox task manager

2. Update graphics drivers.

3. Add more RAM to your system.

That’s it! Which method worked for you?
Let me know if this guide helped you by leaving a comment about your experience. Please like and share this guide to help others.

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