hello, normally such issues are caused by a firewall/security software which doesn't recognize & therefore blocks new firefox versions: Fix problems connecting to websites after updating Firefox

Thanks, but it didn't work. I added Mozilla to the Windows Firewall. How do I add it to Norton?

try to clear all program rules for firefox in your norton software and let it detect the new version again (unfortunately i don't use norton myself, so i cannot give any detailed instructions).

Phillip

Tjhanks for trying but that didnt' work either. I even have uninstalled and reinstalled completely with no luck. This is frustrating since a) all my bookmarks and research are in Firefox; and b) I have no explanation for the problem. Any other ideas?

Paul