Mozilla Firefox is too slow? Here’s how to speed it up

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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  • Mozilla Firefox is a great browser, but it has its share of issues.
  • As for Firefox errors and issues, some users reported that Firefox is slow on their PC.
  • If you’re having this issue, make sure your antivirus isn’t interfering with Firefox and update Firefox to the latest version.
  • This article is just a part of our Firefox hub, so be sure to check it out for more useful guides and news.
firefox slow to start

Firefox is one of the most popular browsers on Windows platform, but despite its massive popularity, Firefox still has certain issues on Windows 10.

Many users are complaining that Firefox is slow on Windows 10, and this can be a major problem if you use Firefox as a default browser on Windows 10, but fortunately, there are few solutions available.

What can I do if Firefox is slow on Windows 10?

Firefox is a great web browser, but sometimes you can experience slowdowns while using it. This can be an annoying problem, and speaking of Firefox issues, users reported the following problems:

  • Firefox slow not responding – Many users reported that Firefox is slow and freezing on their PC. This can be a big problem, but we already covered a similar issue in our Firefox is not responding article, so be sure to check it out.
  • Firefox Quantum slow Windows 10 – Firefox Quantum is the latest version of Firefox, but despite the various improvements, several users reported that the latest version is running slow on their PC.
  • Firefox slow startup, launch, opening Windows 10 – In some cases Firefox might be slow to launch or open on your Windows 10 PC. This can be caused by third-party applications, so be sure to disable all applications that might interfere with Firefox.
  • Firefox slow to load pages Windows 10 – If you’re having this problem on your PC, the issue might be one of your extensions. To fix the issue, be sure to disable all extensions and check if that helps.
  • Firefox slow with multiple tabs, when opening new tabs – Sometimes Firefox can slow down when you open multiple tabs. This can be a problem, but you can usually fix it by checking your settings.
  • Firefox slow playing videos, page rendering – This is another problem that can occur with Firefox. This might be caused by a 32-bit version of Firefox, and if you’re using it, consider switching to a 64-bit version.
  • Firefox slow crashing – Many users reported that Firefox is crashing on their PC. This can be a big problem, and we already covered Firefox crashing issues in one of our previous articles, so be sure to check it out.

1. Change your power settings to High Performance

  1. Press Windows Key + S and enter power settings. Choose Power and sleep settings from the menu.
    Firefox slow playing videos
  2. Now select Additional power settings.
    Firefox slow crashing
  3. Once the Power Options window opens select High Performance profile.

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


2. Switch to a different theme

  1. Open Firefox and click the Menu button in the top right corner and choose Add-ons.
    Firefox Quantum slow Windows 10
  2. Select Get Add-ons tab on the right and click Featured themes.
  3. Try to find a simple theme that won’t use too much of your resources and install it.

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


3. Check your antivirus

If Firefox is slow on your Windows 10 PC, the problem might be your antivirus. Antivirus tool is a necessity, but sometimes your antivirus can interfere with your web browser and cause slowdowns.

Many antivirus tools also tend to install various extensions in order to offer extra protection, but these extensions can also slow down your browser.

If Firefox is running slow, be sure to remove any extensions that are installed by your antivirus. These extensions aren’t mandatory, so you can disable or remove them without fear.

In addition to extensions, you might want to check your antivirus settings and see if modifying your settings fixes the problem.

Several users reported that disabling Active Protection feature fixed the problem for them, so you might want to try that.

As a last solution, you might have to uninstall your antivirus in order to fix the problem. Many users reported issues with Norton antivirus, but after removing it, the problem was completely resolved.

If you decide to remove your antivirus, you should definitely consider switching to a new antivirus solution.

There are many great antivirus tools on the market and the best are Bitdefender, BullGuard, and Panda Antivirus, so feel free to try any of them.

All these applications provide great security and they won’t interfere with your browser in any way.


4. Change your settings

  1. Click the Menu button in the top right corner and choose Options from the menu.
    Firefox slow to load pages Windows 10
  2. Select Privacy & Security from the menu on the left. Now scroll down to Permissions section and make sure that Prevent accessibility services from accessing your browser option is disabled.
    Firefox slow not responding

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

Editor’s Note: This article continues on the next page.