May 26, 2024

In this article, I will discuss various solutions to address the issue of Firefox using 100% CPU usage.

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Basic Troubleshooting Steps

1. Check for any Firefox extensions or plugins that may be causing the high CPU usage. Disable them one by one to identify the culprit.

2. Clear your Firefox cache and cookies to improve browser performance.

3. Update Firefox to the latest version to ensure you have any necessary bug fixes or performance improvements.

4. Disable hardware acceleration in Firefox settings, as this feature can sometimes cause high CPU usage.

5. Consider using an ad blocker like NoScript or uBlock Origin to reduce the strain on your CPU caused by ads on web pages.

Utilize Troubleshoot Mode

  • Enter Troubleshoot Mode by clicking on the three horizontal lines in the top-right corner of the browser window and selecting Help then Troubleshooting Information.
  • In the upper-right corner, click Restart with Add-ons Disabled to enter Troubleshoot Mode.
  • Test to see if the high CPU usage persists while in Troubleshoot Mode. If it does not, an add-on may be causing the issue.
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Manage Plugins and Preferences

Manage Plugins:
– Open Firefox and click on the menu button (three horizontal lines) in the top right corner.
– Select “Add-ons” from the drop-down menu.
– In the Add-ons Manager tab, click on the “Plugins” section on the left.
– Disable any unnecessary plugins by clicking on the “Disable” button next to them.

Manage Preferences:
– Type “about:preferences” in the address bar and hit Enter.
– In the General tab, scroll down to the Performance section.
– Uncheck the box next to “Use recommended performance settings” and adjust the content process limit to a lower number.
– Consider disabling hardware acceleration by unchecking the box next to “Use hardware acceleration when available.”

By managing plugins and preferences in Firefox, you can effectively reduce CPU usage and improve the performance of your browser.

Refresh or Reinstall

If you are experiencing 100% CPU usage on Firefox, there are a few solutions you can try. One option is to refresh your browser. This will restore Firefox to its default settings without losing your bookmarks, history, or saved passwords. To do this, go to the Firefox menu, click on Help, then select Troubleshooting Information. From there, click on the Refresh Firefox button.

If refreshing doesn’t solve the issue, you can reinstall Firefox. First, uninstall Firefox from your computer. Then, download the latest version of Firefox from the official website and install it on your computer. This will give you a clean slate and may help resolve the high CPU usage problem.


Why is Firefox maxing out my CPU?

Firefox may be maxing out your CPU due to extensions and themes consuming more system resources than usual. To troubleshoot this issue, try starting Firefox in Troubleshoot Mode to monitor its memory and CPU usage.

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Why is my browser using 100% CPU?

Your browser may be using 100% CPU due to various factors such as a corrupted browser cache, outdated browser version, excessive browser extensions, or a malware infection.

Why is Firefox slowing down my computer?

Firefox may be slowing down your computer due to the number of extensions installed, which can use up system resources and impact Firefox’s performance.

How do I reduce Firefox GPU usage?

To reduce Firefox GPU usage, you can assign Firefox to a different GPU in Windows Settings or disable hardware acceleration by upgrading your graphics drivers.

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