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

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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 a front-end web developer. Read more
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.
  • Want to learn more about Firefox? Be sure to check our Firefox Hub, for more in-depth guides.
  • If you're interested in other web browsers, check them all out on our dedicated Browsers section.
Firefox issues windows 10

6. Clear your cache

  1. Click the Menu button in the top right corner. Choose Library > History > Clear Recent History.
    Firefox won't open
  2. When Clear All History window opens, set Time range to clear to Everything. Expand the details section and check everything like on our screenshot. Now click Clear Now button.
    Firefox too slow

After doing that, the history should be cleared and the problem will be resolved.

7. Refresh Firefox

  1. Open Firefox.
  2. In the address bar enter about:support and click Refresh Firefox button.
    Firefox keeps crashing
  3. Now follow the instructions on the screen to refresh Firefox.

After you’re done, the Firefox should be restored to default and the problem will be permanently resolved.

8. Remove your Firefox profile

  1. Close Firefox.
  2. Now press Windows Key + R and enter firefox.exe -p. Press Enter or click OK.
  3. List of available profiles will appear. Select your user profile, it should probably be labeled as default and click the Delete Profile button.
    Firefox high CPU usage
  4. Now pick the desired option. If you want to completely remove your profile, click the Delete File button.
    Firefox keeps crashing

After doing that, your profile should be removed, and a new one will be created once you start Firefox. You can also create a new profile from this dialog box. To do so, follow these steps:

  1. Click the Create Profile button.
    Firefox won't open
  2. Click Next.
  3. Enter the desired name for your profile and click the Finish button.
    Firefox using too much RAM

Now you just have to select the new profile and click the Start Firefox button.
Firefox high CPU usage

After creating a new user profile, the issue should be completely resolved. Keep in mind that this method will remove your history, bookmarks and saved passwords, so be sure to back them up beforehand.

9. Consider using Beta or Nightly version

If the Firefox issues are still present, you might be able to solve them simply by switching to the Beta or the Nightly version of Firefox. To do that, you just need to remove Firefox from your PC and then install the Beta version.

The Beta version has the latest updates, but since this version isn’t fully tested, some new issues might appear.

On the other hand, the Nightly version offers the latest updates, as soon as they are implemented, but since these updates aren’t fully tested, it’s possible that some issues might occur.

Firefox issues on Windows 10 can cause many problems, and in most cases, these problems are caused by a third-party application or a Firefox extension.

In order to fix Firefox issues, you just have to disable or uninstall the problematic app/extension.

This article covers:Topics:

Frequently Asked Questions

  • To remove malware from Firefox, press Ctrl + Shift + A to open the extensions page. From there, remove all suspicious extensions that you don’t recognize or remember installing.

  • Yes, Firefox has a Phishing and Malware protection feature that will provide you basic protection against malicious websites.

  • To reset Firefox, click the Menu icon and choose Help > Troubleshooting Information. Now click on the Refresh Firefox button and follow the instructions on the screen.

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Avatar Nikki

why in the world would I turn off my anti virus or security programs to fix an issue with your inability to program a complete browser. I run 3 at a minimum browsers to be compatible with the sites I work with. The only one I have a problem is Fire Fox. Thank started with window 8.1 and has got worse not better. I have used fire fox since it started and now I think it is time to stop. Unless you get programmers and developers who know how to work how to communicate and best of all try using fire fox with the lame broken issues. Like changing everything when you upgrade and have to go in and reconfigure all you things, It has not in the last 5 to 10 years kept my bookmarks and everything else as it was before the upgrade. This latest one stops me from working on ebay site and view pictures and respond to messages for work that I review. You have cost me money this time and it will stop here and now. You have one chance to fix this issue or I go with the other browsers. I can not believe that you are telling people to turn off or uninstall a protection program. Get a brain. Get a life This site is not even secure connection per my security program