Beware Tabnabbing, a New Type of Phishing Attack
Wow. The number of ways you can be fooled into giving up your private logins through a web browser keeps growing.
Adam Engst at Tidbits.com describes the attack using your browser history (you do purge it often, right)? See a demo at StartPanic.com and read more at Krebson Security.
The lesson: keep your browser history clean, do not sign into any secure site from a tab left open, and block as many 3rd-party ads as you can with AdBlock for FireFox. And wait for Firefox to fix this bug in accessing global history.