How to fix: High CPU usage with Firefox Browser?

Firefox is often viewed as the epitome of a safe surfing experience. It also offers a wealth of useful feature sets, which in most cases tick all the important requirements for the end user.

Whether it’s customization or efficient tab management, there’s a lot to look forward to. In addition, it doesn’t consume too much system resources compared to its own Chrome Counterpart. At least that’s what I thought.

After recently switching to Firefox, I noticed that my PC was constantly slowing down. Upon further investigation over Windows Task Manager, the Firefox The browser turned out to be the main culprit. It depleted more than expected amount of RAM and other related resources.

Besides, it wasn’t an isolated incident. Lots of concerned users have posted the same request over different Mozilla support forums. If you’re on the same page too and having high CPU usage issues with the Firefox Browser, then these instructions should help you.


Try the basic fixes

Before we move on to the slightly more advanced fixes, let’s start with a few basic fixes that are known to fix the underlying problem more often than not. Regarding:

  • The first fix asks to stop and then Restart Firefox. Make sure to save any open tabs before doing this.
  • Next up, it is also recommended to use the latest version of the browser. If it doesn’t, you should update it immediately. click on the menu and choose Download Firefox To update. You can also download it manually and install it on your PC.
    Download Firefox Update notification
  • It is also recommended that you shut down your PC properly (no hibernation or hibernation) and then restart it. After booting up, launch the browser and see if the high CPU usage has been resolved or not.

These were the most fundamental fixes that often fix the temporary CPU fluctuation. If that doesn’t help, you can follow the advanced troubleshooting steps.

Boots Firefox into safe mode

Starting the browser in Safe Mode will disable all third-party add-ons, themes, and extensions. So if the browser works as expected in this mode, the high resource consumption could well be attributed to one of these add-ons. Hence, you should consider turning it off.

Here are the steps to boot Firefox in safe mode with add-ons disabled:

  1. begin the Mozilla Firefox Browser
  2. click on the menu horizontal 3bar symbol is at the top right.
  3. Choose help > Reboot with disabled add-ons from the drop-down list.
    Firefox    Reboot with disabled add-ons
  4. This opens the browser in the Safety mode.

Check out how it works now. If you notice a significant improvement, reboot the browser back to normal mode and uninstall the recently installed extensions, one at a time, until the performance problem is resolved.

Third-party add-ons add more functionality to the browser, but they can be the cause of some problems. In these cases, it is best to remove them and look for alternatives.

Use strict tracking protection

Firefox comes with three different levels of tracking protection: Standard, Strict, and Custom. It’s the austerity that is known to block most of the trackers, cookies, and content on various websites. This, in turn, can speed up the loading time of various websites. So you might consider enabling it.

Here are the steps to enable Strict Privacy Policy in the Firefox Browser:

  1. begin the Firefox Browser on a computer.
  2. click on the menu horizontal 3bar symbol and choose Options.
  3. Switch to the Privacy and security Section from the left menu bar.
  4. Choose Strictly -Mode from the “Advanced Tracking Protection” section.
    Enable strict data protection for Firefox Computer browser
  5. Now check if it gives positive results.

One of the major drawbacks of strict mode is that its strong protection mechanism could damage some of the websites and their content. So you may have to adjust to this compromise.

Switch on hardware acceleration

When dealing with graphics-intensive components, Firefox uses your PC’s main process by default. However, other apps may not be able to use the RAM optimally and can therefore slow down the entire PC. So consider telling the browser to use the PC’s graphics processor instead of the main processor.

Here are the steps to enable hardware acceleration in Firefox:

  1. begin the Firefox Browser on a computer.
  2. click on the menu horizontal 3bar symbol and choose Options.
  3. Scroll to the power Section under the General tab.
  4. Disable that Use recommended performance settings Opportunity.
    Use hardware acceleration if available in Firefox
  5. Activate the Use hardware acceleration if available Opportunity.

See if we manage to resolve the high CPU usage problem. to fix Firefox. The hardware acceleration function is completely dependent on the graphics processor, so a weaker chipset may not offer preferred mileage.

Decrease the content process limit

By default, Firefox assigns the maximum available content process (which is 8). This makes it easier for the browser to deal with several open tabs at the same time. On the other hand, it also leads to more RAM consumption. Therefore, you may want to consider decreasing the value for optimal RAM usage.

Here are the steps to reduce the content process limit in firefox:

  1. begin the Firefox Browser on a computer.
  2. click on the menu horizontal 3bar symbol and choose Options.
  3. Scroll to the power Section under the General tab.
  4. Disable that Use recommended performance settings Opportunity.
    This will bring up the Content Process Limit drop-down menu.
  5. Change the value of 8th to something lower, say 4th.
    Set content process limit in Firefox computer

Start anew Firefox and then check whether or not the high CPU usage problem has been resolved. If you decrease the limit on the content process, you may find it difficult to handle multiple tabs at the same time. So consider keeping the number of tabs open at a lower level.

Delete content prefs.sqlite file

the content-prefs.sqlite The file contains data on the user profiles. However, if data becomes corrupt, it can affect the overall performance of the browser. It is therefore recommended to delete this file and leave it Firefox automatically create its new instance.

Here are the steps to delete it firefox Profile with content-prefs.sqlite:

  1. begin the Mozilla Firefox Browser
  2. click on the menu horizontal 3bar symbol is at the top right.
  3. Choose help > Troubleshooting information Opportunity.
    Firefox    Help tab Troubleshooting information
  4. Go to the Application Basics section Profile folder and click on that Open folder Button.
    Open profile folder for Firefox Browser
  5. Choose content-prefs.sqlite File and Extinguish it.
    content-prefs.sqlite file in Firefox Computer profile folder

After that, restart the browser and check whether the resource consumption has been minimized or not. If you delete the above file, you may find that some settings are out of sync with your settings. So make sure you set it accordingly.

Update Firefox (Reset to default)

If none of the above methods have produced good results, then it is time to reset the browser to its default state.

Here are the steps to reset and update firefox Browser on the computer:

  1. copy paste About: support by doing Firefox Address bar and press Enter Key.
    This will take you to the Troubleshooting page.
  2. click on the Update Firefox… Button is on the right.
    Reset and update Firefox BrowserThis will open a confirmation dialog box.
  3. Hit that Update Firefox Command button.
    Update Firefox Command key
  4. Wait for the process to complete and Restart the Firefox Browser.

If you follow these steps, you will lose all installed extensions and all configurations that you have made on the browser. However, if the problem is fixed, it is worth the effort. Just checked if this fixed the high CPU usage.

Bottom line: Firefox High CPU usage

So, that is all from this guide onwards that will help you fix the high CPU usage issue Firefox Browser. We shared a total of seven different fixes that could help you reduce high CPU usage in the Firefox Browser.

In my case, installing some third-party extensions kept the browser’s processes running all the time, which in turn led to high resource consumption. So when I booted the browser in Safe Mode, I was able to determine that these add-ons were indeed the culprit.

As a result, after removing the recently installed extensions, the CPU usage was again within the expected range.

If none of the above fixes worked for you, then it’s better to switch to an alternative browser for your computer. We’ve already listed the best browsers for Windows and macOS.

So let us know in the comments section what success was spelled out in your case.

Finally, here are the recommended web browsers for your computer and mobile phone that you should try.

windowMac OSiOSAndroidLinux
Chrome windowChrome MacChrome iOSChrome AndroidFirefox Linux
Firefox windowSafari MacSafari iOSEdge AndroidChrome Linux
Edge windowFirefox MacEdge iOSSamsung internetEdge Linux

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