It sounds like a problem of mixed version program files; the updater didn't do a full clean-up??

Clean Reinstall

We use this name, but it's not about removing your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. It's not essential to uninstall Firefox, but you can if you like, saying No to any request about removing personal data.

It only takes a few minutes.

(A) Download a fresh installer for Firefox to a convenient location:

https://www.mozilla.org/firefox/all/

(B) Exit out of Firefox (if applicable).

(C) Using Windows Explorer/My Computer, rename the program folder as follows (you might have one or both):

C:\Program Files (x86)\Mozilla Firefox =to=> C:\Program Files (x86)\OldFirefox

C:\Program Files\Mozilla Firefox =to=> C:\Program Files\OldFirefox

(D) Run the installer you downloaded in step (A). It should automatically connect to your existing settings.

Any improvement?

I tried that and now nothing even shows up

smilingsalami said

I tried that and now nothing even shows up

More details please. When you try to start Firefox, nothing happens? When you start Firefox, you get a blank page??

I you haven't tried shutting down and restarting Windows since this problem began, please try that, too, to release file locks and complete any pending system updates.

Try to reboot the computer after having removed the Firefox program folders and check whether those folders are still gone.

You can find the full version of the current Firefox release (57.0) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/
• https://www.mozilla.org/en-US/firefox/57.0/releasenotes/