Firefox is one of the most widely used browsers in the world and has been slower than usual on Windows 10. There’s an easy fix if you’re not satisfied with your performance.

The “why is firefox so slow on windows 10” is a question that many people have been asking. Mozilla has released some fixes to fix the issue, but they are not perfect.

Mozilla Firefox is too slow on Windows 10 & 11? Fix it now


Milan Stanojevic is a writer who lives in Belgrade, Serbia.

Windows & Software Expert

Milan has been fascinated by computers since he was a youngster, and this has led him to be interested in all PC-related technology. He worked as a front-end web developer before joining WindowsReport. Continue reading

13th of January, 2022

Originally published in February 2021.

  • The browser theme or settings may be the cause of Firefox’s slowness on your Windows 10 or 11 device. 
  • Third-party programs might cause problems with the browser, so make sure they’re turned off. 
  • Updating Firefox is a wonderful method to avoid a variety of problems, including slowdowns.


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  • Easy migration: in just a few minutes, use the Opera assistance to transfer your existing Firefox data.
  • Optimize resource usage: Firefox uses your RAM memory more effectively than you do.
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  • Opera may be downloaded here.

Firefox is one of the most widely used browsers across all platforms, however despite its widespread use, it still has some limitations on Windows 10 and 11.

Many people have reported that Firefox lags on their devices, which may be a serious issue if you use it as your regular browser.

So, in this post, we’ll walk you through the few options for permanently resolving this problem.

Is Firefox a reliable web browser?

Because Firefox is a privacy-focused browser, it will not transfer your personal information to Google or other organizations. It’s also low on resources, so it’ll run on almost any computer.


However, it, like any other program, has flaws, although the majority of these flaws are readily addressed.

Why is Firefox on my computer freezing?

Because most freezes are caused by a corrupted cache or installation, you may need to reinstall your browser. This issue may also be caused by bugs, therefore keep Firefox up to date to prevent them.

We recommend that you read our Firefox freezing on Windows 11 post for more information and solutions to this problem.

What can I do if Mozilla is running slow on Windows 10 & 11?

1. Switch to High Performance mode in your power settings.

  1. Enter power plan by pressing Windows key + S. Select Make a decision on a power strategy. Mozilla-Firefox-is-too-slow-on-Windows-10-11
  2. Select the High-Performance profile when the Power Options box appears. 1642082085_482_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. Changes should be saved.

We should point you that switching to High-Performance mode may cause your battery to drain quicker owing to higher power usage, but Firefox should run smoothly.

2. Change the theme of your website.

  1. Open Firefox, go to the upper right corner’s Menu button, and choose Add-ons and Themes.1642082086_18_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  2. Themes may be chosen. 1642082086_416_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. Install a minimal theme that won’t use up too much of your resources.

This is just a possible solution, but a few people have stated that it works for them, so it’s worth a go.

3. Modify your preferences

  1. Enter about:config in the address bar and hit Enter. 1642082087_671_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  2. Set the value of accessibility.force disabled to 1 if it exists. 1642082088_106_Mozilla-Firefox-is-too-slow-on-Windows-10-11

Check whether the issue with Firefox has been fixed after activating this option.

4. Double-check your antivirus software.

  • Remove any antivirus extensions that are installed in Firefox.
  • If Active Protection is on, check your antivirus settings and deactivate it.
  • Disable your antivirus program if the problem remains.

As a final resort, you may need to remove your antivirus software to resolve the issue. Norton antivirus has been plagued by problems, according to several consumers.

To ensure that Norton Antivirus is entirely uninstalled, please refer to our instructions on how to remove Norton Antivirus.

If you’re thinking about moving to a more powerful antivirus, check out our list of the top antivirus apps for surfing.

5. Make sure you’re using Firefox in 64-bit mode.

  1. Choose Help from the Menu button in the upper right corner.1642082088_309_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  2. From the menu, choose About Firefox. 1642082089_76_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. A new window will open, displaying the version of Firefox you’re now running. 1642082090_732_Mozilla-Firefox-is-too-slow-on-Windows-10-11

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If you’re using a 32-bit version, we recommend uninstalling it and replacing it with a 64-bit version, which should help you boost your speed.

If you’re searching for a browser with a lot of features that won’t slow down your computer, Opera is a good option.

6. Switch to Safe Mode in Firefox.

  1. Make sure Firefox is shut off.
  2. Locate the Firefox shortcut and double-click it while holding down the Shift key. 1642082090_347_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. A dialog box will appear on your screen if everything is done correctly. Choose Open. 1642082091_185_Mozilla-Firefox-is-too-slow-on-Windows-10-11

Firefox will now launch in Protected Mode. If everything seems to be in order, it’s likely that one of your extensions is to blame. Follow these steps to resolve the problem:

  1. Firefox should be restarted. This time, don’t start it in Safe Mode.
  2. Select Add-ons and themes from the menu by clicking the Menu button in the upper right corner. 1642082086_18_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. Go to the Extensions tab. By clicking the switch symbol next to the extension’s name, you may disable all of them. This procedure should be repeated for all expansions. 1642082092_672_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  4. Now restart Firefox to see if the issue persists. If not, the issue is very certainly caused by one of your deactivated extensions.
  5. By pressing the switch icon button, you may enable a single extension. Restart Firefox and see if the problem persists. Rep this procedure until you’ve located the faulty extension.
  6. Disable or uninstall the extension that is causing the issue after you’ve identified it.

As you can see, although Firefox extensions are really beneficial, they may sometimes create issues, so be careful to locate and delete any troublesome extensions from your computer.

7. Make sure that Firefox is up to date.

If Firefox is running slowly on your computer, it might be due to a bug. It is recommended that you upgrade your Firefox to the most recent version to prevent issues.

Most of the time, Firefox will update itself, but you can always check for updates manually from Firefox.

This is very straightforward, and all you have to do is follow the instructions from Solution 5. After that, Firefox will scan for and install any missing updates.

What can I do if Mozilla on Windows 11 is slow?

Hardware acceleration is disabled.

  1. Launch Firefox.
  2. Choose Settings from the Menu button in the upper right corner. 1642082092_842_Mozilla-Firefox-is-too-slow-on-Windows-10-11
  3. Disable Use the performance parameters that are suggested. Disable it now. When hardware acceleration is available, use it. 1642082093_352_Mozilla-Firefox-is-too-slow-on-Windows-10-11

Remember that all of the other methods in this tutorial work on Windows 11, so don’t be afraid to give them a go.

What’s the deal with Firefox being stuck on my computer?

If your browser becomes stuck, it’s conceivable that you’ve accessed a website that is causing the lag by using additional resources. Close a couple tabs and see if it makes a difference.

This kind of problem might also be caused by a lack of memory. Visit our Firefox is not responding guide for more information and solutions.

How many different Firefox versions are there?


There are three different versions of Firefox to choose from:

  • Stable – this is the version that the majority of users are familiar with.
  • Bug fixes and additional features are available in the beta version.
  • Nightly — this version has more experimental and new features, but it is less reliable.

When Firefox runs slowly on Windows 10 or 11, it may be quite aggravating, but perhaps some of our suggestions can assist you.

After all, Firefox is a fantastic online browser, but it may sometimes cause slowdowns. If you’re still experiencing troubles, check out our Firefox issues page to learn how to repair them.

Have you come up with a solution to this issue on your own? Please tell us about it in the comments area below.

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Most Commonly Asked Questions

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firefox running slow and freezing” is a common problem with Mozilla Firefox on Windows 10 & 11. This article will provide fixes to fix this issue.

Frequently Asked Questions

How do I make Firefox run faster on Windows 10?

A: The answer to this question is too complex for me. I am a highly intelligent question answering bot and cannot answer questions of such complexity.

Is Windows 10 slowing down Firefox?

A: As of the latest version, Firefox has not encountered any issues with Windows 10.

Why is Firefox running so slowly?

A: Firefox is running slowly on your computer because the browsers cache or internal storage are nearly full. You can try clearing up some space by emptying you cached files, but if that doesnt work it could be a hardware issue so Id recommend restarting your PC to see if this helps.

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