I uninstalled and reinstalled Firefox. That did the trick.
However now I'm noticing that hyperlinks in emails that I open with Thunderbird don't work. Now I'm reinstalling Thunderbird. Gotta back up my emails with MozBackup first. Strange days indeed...
UPDATE: I uninstalled and reinstalled Thunderbird with my old emails but still the same problem. So next I cleaned the registry and did a "disk cleanup" and one of those two or both fixed it. Yeah!!! Hope this helps someone in the future......