And this was first reported on 19-12-2006 saying "Lost Everything in My Account..email,contacts,sent mail..". It further explained the issue as;
Found my account clean..nothing in Inbox, contacts ,sent mail..How can all these information residing in different folders disappear? ..How to write to gmail help team to restore the account..is it possible? ..Where to report this abuse?.
This message received so many replies saying others also faced the issue. But one important point came up there was that they were using Firefox 2.0.
Another user pointed out that the following message was left after deleting all the mails.
"This is not a mistake. All your emails and contacts have been deleted
on purpose. This was a malicious attack and not an error. Have a nice
day. =)"
People who got attacked had kept the Gmail opened under Firefox 2.0. I was also used to keep my Gmail opened under Firefox 1.5 (not 2.0) and fortunately I was not caught to the attack.