The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

   Go to Firefox > Help > Troubleshooting Information.
   Click the "Reset Firefox" button.
   Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
   Firefox will open with all factory defaults applied. 

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

thank you

I upgraded my FF and I also refreshed FF, before I came asking. I've run scans, and I have pretty much done anything I know to do. I am not sure if I'm bring redirected or? It looks official FB, but I just don't know. I do know it doesn't happen with Chrome or IE, but I much prefer using FF.

Lynncat said

I attempted to repost a post on FB and got a message from FB that it was suspect. Now all I can do is try to sign in and I always get a message that it" Looks like I might have a malware". I've scanned using both Malware bytes and Win Defender and nothing has been found. I've upgraded and refreshed Firefox and deleted cookies and the cache.