Firefox may require significant system resources to download, process, and display web content.
Sometimes, you may encounter the Firefox high CPU issue on Windows 10/11.
This post fromMiniToolprovides reasons and solutions for the issue.
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Firefox has long been considered a very good and secure web internet tool.
However, users noticed that Firefox was using more CPU power than normal.
How to fix the Firefox your internet tool is managed by your organization issue?

This post provides some feasible and useful methods for you.
First, you might take a stab at exit Firefox and restart it.
Then, its recommended to update the Firefox surfing app.

To do this, tap the menu icon >Help>About Firefoxand it will check for updates automatically.
If there is a update, it’s possible for you to download and install for your Firefox.
Thus, you’re free to consider to disable it.

Run Firefox in Troubleshoot Mode can disable all the third-party add-ons, themes, and extensions.
Step 2: Go toHelp > Troubleshoot Mode…. Click theRestartbutton to continue.
look to see if the Firefox high CPU on Windows 10/11 has been fixed.

If not, continue to follow the below fixes.
Step 2: Click theAdd-ons and themesoption.
Step 3: Click theExtensionstab and find the extension may cause the Fiefox high CPU issue.

smack the three-dots and chooseRemove.
Step 4: Then, go to thePluginstab and shut down the plugins that you dont need.
you might disable it.

Step 2: ClickSettings.
Under theGeneraltab, scroll down to find thePerformancepart and uncheck theUse recommended performance settingsbox.
Step 3: Thenuncheck theUse hardware acceleration when availablebox.
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Here is how to do that:
Step 1: Hold down theShiftkey and thendouble-clickthe Firefox tool.
Step 2: ClickRefreshto reset Firefox to its default state.
Step 2: Go toHelp > More troubleshooting information.
Step 3: Click theOpen Folderbutton next to theProfile Folderoption.
Step 4: Locate the following items and right-click them one by one and clickDelete.
Thus, you should probably clear cookies and cache in Firefox.
Step 2: ClickSettings>Privacy & Security.
Step 1: Typecontrol panelin theSearchbox.
Step 2: ClickUninstall a programunderPrograms.
Step 3: Scroll down to findMozilla Firefox, right-click it and clickUninstall.
What is Mozilla Thunderbird?
How to download Thunderbird and install/uninstall it on your Windows/Mac?
This post provides a full guide for you.
you could try them one by one until you fix the issue.