You can go to the location where you have Firefox installed. This might be at the Program files (x86), and delete the entire Firefox folder.

Once you're finished with that, visit this support page, to find an older version back. https://support.mozilla.org/en-US/kb/install-older-version-of-firefox

I hope this fixed your problem. If not, please leave a reply!

Did you find this article and did anything here help?

• Firefox hangs or is not responding - How to fix

Have you already tried either of these things?

• Refresh Firefox - reset add-ons and settings
• Profile Manager - Create, remove or switch Firefox profiles (create new profile for testing, don't delete the existing one)

Yes I have already tried these methods numerous times same problem is always present. Many thanks for the help.

Could you describe the symptoms in more detail. For example: Are you getting "NOT RESPONDING" for 10-30 seconds and then it returns to normal? Is there a lot of hard drive activity during that time? Does this occur primarily when Firefox is using over 2GB of memory? Etc.

In my personal case I use IObit Uninstaller 6.0.2 Free for Windows found in this page (beware because they have a bigger paid version)

   http://downloads.tomsguide.com/IObit-Uninstaller-2,0301-52763.html

Note: After deletion wait a bit for complete deletion of residual files. it will ask you permission to delete.

I use Win 7

P.S. 1- After trying to fix a firefox problem by running it in safe mode (without all addons) 2-One thing I did in the past: after making certain I did have a copy of Firefox in my download library, I disconnected my pc from the internet and executed the firefox installer from my downloads library.