I don't know how appears to you but check Extensions / Facebook permissions. Put a screenshot maybe.

This is what facebook looks like. I uninstalled and reinstalled Firefox, but no better.

Have you an Antivirus/Firewall software ? The clock shows the real time ? In other browsers are the same ?

McAfee. Yes real time. Facebook works fine in Chrome.

Try to refresh the firefox. Remove '%AppData%/Mozilla' directory.

I did "refresh" firefox, but did not help. Facebook was working fine on firefox yesterday, but not today. Thanks anyway for answering. I'll just use chrome.

Just fyi, it was that lousy McAfee "net guard" that was on!!! Turned it off, and all is good! Thanks again.