Full Fix: Mozilla Firefox is too slow on Windows 10, 7

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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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.

Firefox is slow on Windows 10, how to fix it?

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.

Solution 1 – Change your power settings to High Performance

Many users reported that Firefox is running slow on their PC, and this issue is most often caused by your power settings. According to users, Windows 10 sometimes changes your power plan to Power Saving once your upgrade to it, so it’s advised that you change your settings to High Performance. To do that, follow these steps:

  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.

Solution 2 – Switch to a different theme

This is a possible workaround, but few users reported that it works, so you might want to try it. According to users, switching to a different, less demanding theme fixes issues with slow Firefox on Windows 10. Users reported that using a theme such as High Contrast theme fixed all slowdown issues for them.

By changing the default theme to less demanding one, Firefox might not look visually appealing, but it should work faster than before. To change your Firefox theme do the following:

  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.

Solution 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.

Solution 4 – Change your settings

If your Firefox is running slow, the problem might be your settings. Sometimes certain Firefox services can interfere with Firefox and cause slowdowns to occur. However, you can fix that by doing the following:

  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.

Solution 5 – Check if you’re using a 64-bit version of Firefox

If Firefox is slow on your PC, the problem might be because you’re using a 32-bit version. Unless you have a 32-bit processor and 32-bit version of Windows 10, there’s no need to use the 32-bit version of Firefox. 32-bit software can’t fully utilize your processor, and that can cause this issue to appear.

To see which version of Firefox you’re using, do the following:

  1. Click the Menu button in the top right corner and choose Help.
    Firefox slow startup
  2. Now select About Firefox from the menu.
    Firefox slow to load pages Windows 10
  3. A new window will now appear showing you the version of Firefox you’re using.
    Firefox slow with multiple tabs

If you’re using a 32-bit version, we advise you to uninstall it and switch to a 64-bit version instead. There are several ways to uninstall an application, but if you want to remove it completely, it’s always a good idea to use an uninstaller software.

Uninstaller applications are designed to remove all files and registry entries associated with the application you want to remove. As a result, you’ll completely remove the application from your PC. There are many great uninstaller applications, but the best are IOBit Uninstaller, Revo Uninstaller, and Ashampoo Uninstaller, so feel free to try any of them.

Solution 6 – Start Firefox in Safe Mode

Firefox has its own Safe Mode feature, and if your Firefox is running slow, you might be able to troubleshoot the problem by using the Safe Mode feature. This feature starts Firefox without any plugins or extensions, so it will start Firefox in its most basic form. To start Firefox in Safe Mode, do the following:

  1. Make sure that Firefox is closed.
  2. Locate Firefox shortcut, press and hold the Shift key and double click Firefox shortcut.
  3. If done properly, you’ll see a dialog box on your screen. Select Start in Safe Mode.
    Firefox slow not responding

Firefox will now start in Safe Mode. If everything is working properly, it means that one of your extensions is causing this problem. To fix the issue, do the following:

  1. Restart Firefox. Don’t start it in Safe Mode this time.
  2. Click the Menu button in the top right corner and choose Add-ons from the menu.
    Firefox Quantum slow Windows 10
  3. List of installed extensions will now appear. Disable all extensions by clicking the Disable button next to the extension’s name. Repeat this step for all extensions.
    Firefox slow launch
  4. Now restart Firefox and check if the problem still appears. If not, the problem is definitely related to one of your disabled extensions.
  5. Enable a single extension by clicking the Enable button. Now restart Firefox and check if the issue reappears. Repeat this step until you find the problematic extension.
  6. Once you find the extension that is causing the problem, disable it or remove it.

As you can see, even though Firefox extensions are rather useful, they can cause certain problems to appear, so be sure to find and remove the problematic extensions from your PC.

Solution 7 – Check if Firefox is up to date

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

This is rather simple and in order to do that, you just need to follow steps from Solution 5. After doing that, Firefox will check for missing updates and install them.

It can be quite frustrating when Firefox is running slow on Windows 10, but hopefully, some of our solutions might be might be helpful to you. We also wrote an article about Thunderbird issues on Windows 10, so if you’re using this email client, feel free to check that article.

Editor’s Note: This post was originally published in May 2016 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.