Hi,

Please check if this happens in Safe Mode.

Problematic Extensions

Troubleshooting Extensions and Themes

Uninstalling Add-ons

Uninstalling Toolbars

Can you kindly tell me how I can get to safe mode? I can't open my browser at all to even get to the option Safe Mode. Thank you so much, GG. <3

You can try to type firefox -safe-mode in the Start menu Run box (or press Windows key + R) and press OK.

Hi, it should be firefox -safe-mode in my previous post. Sorry about the error. I've corrected it.

Hmm, nothing's showing up. The only safe mode thing that comes up is Mozilla Sunbird's safe mode. Thanks for your time, it is greatly appreciated. By the way, Firefox is installed in my Program Files (x86). Is this right?

You can try to put the full path in double quotes: "?:\Program Files (x86)\Mozilla Firefox\firefox" -safe-mode.

Nothing's showing up there, either. I don't really know what's going on. I am having my boss check it out when he gets back to the office, so for now I'm using Chrome. It's the first time and it's SO annoying because I have no saved passwords in Chrome. But I want to thank you for helping me try to figure this out!

Please also try deleting the updates.xml and firefox-moz* files and the updates folder in the Program Files folder, if present.

You can take a backup of the important files which could be useful later. The personal files/settings are stored in the Firefox Profile Folder.

The key3.db + the signons.sqlite are needed to restore saved passwords. The places.sqlite stores the bookmarks and the history, the cert8.db stores the imported certificates etc. Please also see Backup

Firefox Profile Files.

Ooooh! Okay, thanks! Yeah, I do regularly back up Firefox using MozBackup, so once my Firefox is fixed, I should be good to go! Thanks again! Happy Early Groundhog day :D

If using Zone Alarm's browser virtualization or any other similar product or a sand-boxing program (i.e., Sandboxie), turn it off when updating Firefox or Firefox Add-ons. You can post on the forum for any such product that you might be using to get other instructions on the proper use of the product.

The updater wasn't able to update all the files and some were left as older versions. Do a clean reinstall. See: Browser will not start up - XUL Runner error after an update

1. Download a fresh Firefox copy and save the file to the desktop.
   • Firefox current version: http://www.mozilla.com/en-US/firefox/all.html
2. Uninstall your current Firefox version.
   • Do not remove personal data when you uninstall the current version
   • 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.
   • See Uninstalling Firefox and Uninstalling Firefox (Mozillazine)
   • Also see: Backing up your information and Profile backup (Mozillazine)
3. Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
   • It is important to delete the Firefox program folder/directory to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
   • See: http://kb.mozillazine.org/Installation_directory
4. Install the fresh copy of Firefox that you downloaded in step 1

If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

Oh! Yes, I was running Zone Alarm at the same time. So, I should turn off Zone Alarm, uninstall Firefox, reinstall it and then it should work? And then I should turn my Zone Alarm back on, right? Thank you!!

Thank you so much, this totally worked. I am very happy!