Having Firefox issues? Here’s how to fix them for good

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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Affiliate Disclosure

  • Mozilla Firefox is a great browser with millions of users worldwide.
  • Unfortunately, Firefox errors can sometimes appear, but you should be able to fix most of them with our solutions.
  • The easiest way to deal with Firefox errors is to disable all extensions or check if your antivirus or firewall is blocking Firefox.
  • Want to learn more about Firefox? Be sure to check our Firefox hub, for more in-depth guides.
firefox problem loading page

Firefox is one of the most used web browsers in the world, and this application has been around for years.

Firefox is known as one of the best browsers for Windows platform, but unfortunately, it seems that Windows 10 users are having certain issues with Firefox on Windows 10.

How do I fix Firefox problems on Windows 10?

Firefox issues can be problematic, and prevent you from using your browser. As for issues, we’ve complied a list of common problems that users reported with Firefox:

  • Firefox won’t open – This issue can occur if there’s a problem with your Firefox profile. To fix it, simply recreate the profile and check if that solves your issue.
  • Firefox too slow, using too much RAM – High RAM usage can occur due to your extensions, so be sure to disable all extensions that you don’t need and check if that helps.
  • Firefox high CPU usage – Sometimes high CPU usage can appear and cause issues with Firefox. This can be due to your antivirus, so be sure to disable it temporarily.
  • Firefox keeps crashing, freezing, not responding – Sometimes your configuration can cause problems with Firefox. However, you can fix that problem simply by starting Firefox in Safe Mode.

1. Check your antivirus

If you’re experiencing Firefox issues on your PC, the issue might be your antivirus software. Several users reported that HTTPS Scanning feature in Avast caused issues with Firefox, but you can fix this problem by doing the following:

  1. Open Avast from and choose Settings in the bottom left corner.
  2. Choose Components > Web Shield.
  3. Now click Customize button.
  4. Uncheck Enable HTTPS Scanning option and save changes.

If you’re using a different antivirus software, you might want to try disabling this or other similar features in it. In case that doesn’t work, your next step would be to completely disable your antivirus software.

Several users reported that this wasn’t effective, and according to them, they managed to fix the issue by removing their antivirus altogether.

If removing the antivirus solves your problem, you should consider switching to a different antivirus solution.

Bitdefender offers great protection and a great optimization, so it won’t interfere with any of your applications. It also has a huge signature base and special features that will block the newest cyber-threats.

If you’re looking for a new antivirus, you definitely need to try it out.

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2. Disable problematic add-ons

  1. Open Firefox and click the Menu button in top right corner.
  2. Choose Add-ons from the list.
    Firefox too slow
  3. Click the Extensions tab on the left. List of installed extensions should open.
  4. Now disable all extensions by clicking the Disable button.
    Firefox high CPU usage
  5. Restart Firefox and check if the issue is resolved.
  6. If the problem is fixed, you can try enabling extensions one by one until you find the one that is causing you problems.

According to some users, the add-on that caused the crash for them was FlashGet, but bear in mind that almost any add-on can cause Firefox to crash, so you might have to disable or remove certain add-ons in order to fix this issue.

If you can’t open Firefox at all, it’s always a good idea to run it from Safe Mode. To access Safe Mode do the following:

  1. Press the Start button, click the Power button, press and hold Shift on your keyboard and choose the Restart option.
  2. Once your computer restarts, choose Troubleshoot > Advanced options > Startup Settings and click the Restart button.
  3. After your computer restarts again press F5 to choose Safe Mode with Networking.
  4. When Safe Mode starts, try disabling any extensions from Firefox by following the steps above.

If Firefox works normally in Safe Mode, the issue is probably caused by some third-party program that you have installed, so you’ll have to find the problematic program and disable it in order to fix this problem.

3. Start Firefox in Safe Mode

  1. Locate the Firefox shortcut on your desktop, hold the Shift key and double-click it.
  2. When the dialog box appears, click Start in Safe Mode button.
    Firefox won't open

After doing that, Firefox should start in Safe Mode. If the issue doesn’t appear in Safe Mode, it’s possible that one of your extensions or settings are causing this issue.

4. Reinstall Firefox

If Firefox issues are interfering with your work, perhaps you should try reinstalling Firefox. Sometimes your installation can get corrupted, and that can cause various issues. However, you can fix that problem, simply by reinstalling Firefox.

There are several methods that you can use to reinstall Firefox, but the most effective one is to use uninstaller software.

In case you don’t know, uninstaller software such as IOBit Uninstaller will can completely remove any application from your PC.

In addition, this software will also remove all files and registry entries associated with the application you want to remove ensuring that these files don’t interfere with your system.

This is a tool you definitely need on your PC especially if you often install and uninstall various software.

Once you remove Firefox, install it again and check if the problem is still there.

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