Gmail can't be loaded in Firefox

A few hours ago, I couldn't access my Gmail in Firefox, the mail loading process looped endlessly. However I was able to access my mail using basic HTML view.












- Loading runs into infinite loop

It was not an error on Gmail server as I had no problem logging in with other browsers. I guessed there must be something wrong with Firefox, so I cleared the cache in Firefox and in the end problem solved! Standard view of Gmail loaded successfully and everything run fine.
This problem is listed under Gmail Known Issues actually.
Have you encountered issues listed at there?

Gmail Multiple Login

Recently I and my colleagues are sending invitation letter to businesses for our Google Online Marketing Challenge and we are sharing a Gmail account that created just for this challenge. As usual, I will check the Sent Mail after a mail is sent, when I was looking at the Sent Mail, suddenly a new sent item appeared, and a few seconds later, another mail was sent and appeared on top of all sent mail. Mailbox hijacked? Of course no, one of my colleagues was logged in and sending mail at the same time. Just realized that Gmail(& others popular webmail as well) allow simultaneous login to one account from different computer or browser(session). Now I wonder is there a way to check or track simultaneous login...

GMail Flaw - Mailbox can be hijacked

Hackers can make use of the vulnerability in Gmail filtering feature to get the current and upcoming mails of a user by forwarding all the mails to their desired mailbox.
According to Petko Petkov, a web vulnerability researcher, when a user visiting a malicious website while still logged into Gmail, a "multipart/form-data POST" will be performed to one of the application programming interfaces, followed by injection of filter into user's filter list, then the filter will send all the mails that match the rule, including future mails also. That means even the vulnerability is fixed by Google, the mails will be forwarded also as long as the filter is still there. See Gnucitizen for screenshots and details.
So check your GMail filter list under settings now.