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Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

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New Contributor

Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Firefox will not open. Little wheel spins, then disappears. Nothing. Re-started computer - several times. Reinstalled Firefox. Nothing. Can't open in Admin. Can't open with double click or with right-click "Open". Many fixes on this site suggest going to the Firefox button to disable add-ons - of which I have few - however since Firefox won't start, I can't try these options. Can't get to my profile. (Have not changed my profile or add-ons for ages.) This seems to have happened right after the most recent update. I've read everything I can find on this website and other places, and can't make it work. Can't find old Firefox on program list, thus can't uninstall old version - perhaps this occurred automatically with new Firefox download?. Ran Spybot and deleted some adware and mal-ware. Still nothing. Ran Microsoft Security - nothing. I'm running Windows 7. I can't open the troubleshooting file offered below. Firefox was working well until yesterday. Sigh. Can anyone help with this?

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1 ACCEPTED SOLUTION

Accepted Solutions
Site Moderator

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

You can use one of these to start Firefox in Safe Mode:

  • On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
  • On Mac, hold down the Options key while starting Firefox
  • Help > Restart with Add-ons Disabled

Create a new profile as a test to check if your current profile is causing the problems.

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

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

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.

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

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

If you keep having problems then also create a new profile.



Do a malware check with some malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:

8 REPLIES
Grand Master Contributor

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Support Forum Moderator

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Site Moderator

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

New Contributor

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Nope, can't even open in safe mode...

New Contributor

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Tried that and it didn't work. I pressed F8 at the screen that shows some F-key options at the bottom. Hope that's the "boot screen".

New Contributor

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Keep getting a message that says "A script on this page may be busy or it may have stopped responding." Neither Continue nor Stop Script help.

Then it says: Script: resource://gre/components/nsBlocklistService.js:771

or sometimes it says: Script: chrome://cloudmagic/content/bg.plugin.frame.html:45

New Contributor

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Holy cow! It just opened - I have no idea why - then I got THIS error: Error: Illegal operation on WrappedNative prototype object

That error box would only go away with a bunch of clicks.

Do you think it's fixed?

Will look at add-ons if poss.

Site Moderator

Re: Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

You can use one of these to start Firefox in Safe Mode:

  • On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
  • On Mac, hold down the Options key while starting Firefox
  • Help > Restart with Add-ons Disabled

Create a new profile as a test to check if your current profile is causing the problems.

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

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

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.

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

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

If you keep having problems then also create a new profile.



Do a malware check with some malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also: