Mozilla Firefox is too Slow on Windows 10 & 11? Fix it Now

by Milan Stanojevic
Milan Stanojevic
Milan Stanojevic
Windows & Software Expert
Milan has been enthusiastic about PCs ever since his childhood days, and this led him to take interest in all PC-related technologies. Before joining WindowsReport, he worked as... read more
Fact checked by Alex Serban
Alex Serban
Alex Serban
Browser & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
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  • When Firefox is slow on your Windows 10 or 11 device, the browser theme or settings might be the main reason. 
  • Third-party applications can interfere with the browser, so be sure to disable them. 
  • Keeping Firefox up to date is a great way to prevent all sorts of issues including slowdowns.
firefox-w10 firefox slow windows 10
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Firefox is one of the most popular browsers on all platforms, but despite its massive popularity, it still has certain issues on Windows 10 and 11. Believe it or not, Firefox can be slow even in 2022.

Many users are complaining that Firefox is lagging on their devices and this can be a major problem if you use it as a default browser.

So, in this article, we’re guiding you through the few solutions available to fix this issue once and for all.

Why is Firefox so slow?

There are many possible reasons behind a slow browser, but the most common ones seem to be the following:

  • Outdated version – If Firefox is operating slowly for you, the first thing you should do is check to see if there are any updates available for it. If you keep your browser’s version up to date, you’ll be able to remove several potential reasons for the delay.
  • Hardware acceleration – It is possible for hardware acceleration to improve speed. But, if you have driver problems or have a specific GPU configuration, it may create latency instead. Firefox may be made to run more quickly by disabling the hardware acceleration feature.
  • The browser theme – You have the ability to use a custom theme in Firefox; but, doing so may sometimes slow down the performance of the browser. To determine whether or not there is a change, you should revert to the Default theme.
  • Third-party antivirus – There is some evidence to suggest that using an external antivirus application such as Avast might make Firefox perform more slowly. Instead, check out our best antiviruses that are compatible with Windows 10/11.

But keep in mind that your case can be caused by a different reason such as too much cache and cookies or faulty add-ons. Nonetheless, we will try to address every instance and provide efficient solutions.

Why is Firefox so slow on Mac?

Firefox could be slow on Mac because there are too many apps running that are resource hungry, the browser has very limited room to handle the requests it receives, or you are using a rather antiquated version of the Firefox web browser.

Alternatively, your installation of Firefox could have a significant amount of data stored in its cache, as well as browsing history, downloads, and add-ons.

But nonetheless, your Mac could be running slowly in general, leading you to believe that the problem lies with Firefox.

Is Firefox a good browser?

Firefox is a privacy-oriented browser, so it won’t send your personal data to Google or other companies. It’s also relatively light on resources, so it will work on any PC.

However, just like any other software, it has certain issues, but most of these problems can be easily fixed. Don’t miss out on our performance and feature comparison between Opera and Firefox and decide which one’s better for you.

Why is Firefox freezing on my PC?

In most cases, freezes occur due to damaged cache or installation, so you might need to reinstall your browser. Bugs can also cause this problem, so keep Firefox updated to avoid them.

To learn more, we encourage you to visit our post on Firefox freezing on Windows 11 for more information and ways to deal with this issue.

Is there a lightweight Firefox alternative?

Yes, a good browser that is even lighter than Firefox is Opera GX. It’s specifically developed to be able to carry out demanding tasks like loading video content or gaming without taking a toll on your memory.

Actually, the browser has built-in CPU and RAM limiter features, so you can improve response rates even more. They are easy to enable/disable in just one click and contribute a ton to performance.

The browser won’t use resources to load ads if you enable the built-in adblocker. The transition should be seamless, because Opera GX has a modern and intuitive UI, with familiar controls.

We recommend that you take a look at our comparison between Opera GX and Firefox to see their differences in a more detailed manner.

Opera GX

Transfer all your data to Opera GX and enjoy seamless browsing with minimal resource impact.

How do I make Firefox run faster on Windows 10?

1. Change your power settings to High Performance

  1. If Firefox’s startup is slow on Windows 10, press the Windows key + S to enter power plan. Select Choose a power plan from the results.choose-powerplan-w10 firefox slow windows 10
  2. Once the Power Options window opens, select the High-Performance profile and save the changes.high-per-w10 firefox slow windows 10

We have to mention that switching to a High-Performance mode will drain your battery faster due to increased power consumption, but Firefox should be working without any slowdowns.

Moreover, there is an even more performance-focused mode that you can enter in Windows 10 that will allow you to use your PC in peak conditions.

2. Check if Firefox is up to date

  1. If Firefox is running slow on Windows 10, click on the menu icon from the top right corner and select Settings.firefox-settings firefox slow windows 10
  2. Next, type update inside the Settings’ search bar and click on the Check for updates button.update-firefox firefox slow windows 10

If Firefox is slow on your PC, the problem might be a certain bug. In order to avoid Firefox bugs, it’s advised to update your Firefox to the latest version.

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In most cases, Firefox will perform the update automatically, but you can always check for updates manually from Firefox.

3. Switch to a different theme

  1. Open Firefox, click the Menu button in the top right corner, and choose Add-ons and themes.firefox-addon-w10 firefox slow windows 10
  2. Select Themes and try to find a simple theme that won’t use too much of your resources and install it.themes-firefox firefox slow windows 10

This is just a potential workaround, but few users reported that it works for them, so you might want to try it.

4. Change the accesibility.force feature

  1. In the address bar of Firefox, enter about:config and press Enter.config- firefox slow windows 10
  2. Search for accessibility.force_disabled and set its value to 1 by clicking on the edit icon on the right side. This way, the Firefox is slow on Windows 10 issue will be resolved.accessibility firefox slow windows 10

After enabling this option, check if the problem with Firefox is resolved.

5. Check your antivirus

You can try to disable your antivirus while browsing on Firefox, but that will leave you exposed to online threats.

Alternatively, you might have to uninstall your antivirus altogether, in order to fix the problem. Many users reported issues with Norton antivirus.

We encourage you to check out our guide on how to remove Norton Antivirus to make sure it’s completely removed.

If you consider switching to a more effective antivirus, visit our best antivirus programs for browsing article for suggestions.

6. Clear your browsing data

  1. Tap on the menu icon from the top right corner and select Settings.firefox-settings firefox slow windows 10
  2. Now type clear inside the search bar and select Clear Data.clear-data-firefox firefox slow windows 10
  3. From the Clear Data window, make sure to select all the boxes and click Clear.clear-cookies firefox slow windows 10

In case you’re looking for a browser with great functionality that won’t slow down your PC, you might want to give Opera a try.

7. Disable add-ons

  1. Open Firefox and click on the menu icon followed by Add ons and themes.firefox-addon-w10 firefox slow windows 10
  2. Here, click on Extensions and make sure to toggle off all of your extensions in order to speed up the browser.extensions-addons firefox slow windows 10

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

Disable hardware acceleration

  1. Open Firefox and click the Menu button in the top right to choose Settings.firefox-settings firefox slow windows 10
  2. Scroll down until you mee that Performance section and disable Use recommended performance settings. Now disable Use hardware acceleration when available.performance-disable firefox slow windows 10

Keep in mind that all other solutions from this guide also work on Windows 11, so don’t be hesitant to try them.

Why is Firefox stuck on my PC?

If the browser gets stuck, it’s possible that you’ve opened a website that is using more resources thus causing the slowdown. Try closing a few tabs and check if that helps.

Lack of memory can also lead to issues such as this one. To learn more, visit our Firefox is not responding guide for additional solutions.

How many versions of Firefox are there?

There are three versions of Firefox available for download:

  • Stable – the regular version that most users are using
  • Beta – offers bug fixes and new features
  • Nightly – this one offers experimental and new features, but it’s less stable

It can be quite frustrating when Firefox is running slow on Windows 10 or 11, but hopefully, some of our solutions might be helpful to you.

After all, Firefox is a great web browser, but sometimes you can experience slowdowns while using it. In case you’re having more problems, you should check out our Firefox issues guide to see how to fix them.

Did you find a solution to this problem on your own? Share it with us in the comments section below.

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Frequently Asked Questions

  • To make Firefox faster, make sure you clean the cache frequently. We’ve covered this Firefox being too slow topic in detail, so check it out.

  • Generally no, Firefox isn’t slower than Chrome, but the browser speed is affected by several factors including your hardware, number of open tabs and extensions.

  • To optimize Firefox, be sure to keep it updated at all times. Usually, when you optimize your entire Windows system, the browser will also perform better.

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