This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox crashes

  • 1 reply
  • 1 has this problem
  • 4 views
  • Last reply by cor-el

more options

Firefox crashes on startup, even in safe mode. I checked for Backdoor.Ulrbot.C and found nothing.

https://crash-stats.mozilla.com/report/index/94330dc4-2b05-4f06-a38d-7054e2111116

My problem might be due to a system restore. I also use Roboform but I made sure I have the most updated version. I have also tried to uninstall and reinstall Firefox. Please advise. Thank you!

Firefox crashes on startup, even in safe mode. I checked for Backdoor.Ulrbot.C and found nothing. https://crash-stats.mozilla.com/report/index/94330dc4-2b05-4f06-a38d-7054e2111116 My problem might be due to a system restore. I also use Roboform but I made sure I have the most updated version. I have also tried to uninstall and reinstall Firefox. Please advise. Thank you!

All Replies (1)

more options

Try a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version if possible.

  • Do not remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.