POP3 message count remains at 0

I upgraded to Firefox  33 and now X-Notifier doesn't seem to show new messages for my POP3 account.

I went ahead and re-added the account making sure all details were correct.  When I check it with X-notifier it does not show any messages.  The green circle spins for a bit but message count always remains at zero (I sent test messages to myself to ensure I had unread email in my inbox).

Any idea why?

Windows 8.1 Pro .

Thank you.