Gmail and Google Aps Email 502 Server Error

Gmail 502 Server Error
Gmail 502 Server Error

Today when I try to check my gmail from FireFox, I encounter 502 Server Error. But when I try different browser like Internet Explorer 8, I was able to check it smoothly. So, there is problem in Firefox and gmail.

Further after that I realized that if you clear your Firefox browser cache and cookies than you will be able to check your email even from FF.