Quote Originally Posted by Ashwin View Post
Issue resolved:

The culprit was AVG Link scanner. Gmail worked fine after I disabled the addon in Firefox.

I confirmed this by reinstalling Online Armor, restarting the PC and observed it since last night.

Gmail works fine now.
And we were bashing the OA all this time.

I am still not sure if it was only Linkscanner as I have AVG installed with Linkscanner and I am not facing any issues. Only difference with you is that I have not installed OA or any other firewall.

May be its something to do with the combination of AVG and OA... but anyway good to know that your issue is resolved.