First off, I apologize in advance if I posted this in the wrong board, but it didn't seem to fit in the other ones. Specs: I use Windows XP Professional, Service Pack 2 and my browser is Firefox 3.0.13 For the past few weeks I've been noticing every now and then that when I go to login somewhere online, other people's usernames will show up in the drop down box in the Username field. For example, if I'd logged into a few different myspace accounts with different e-mail addresses, when I clicked the Username field while logging in it might list the various e-mails I've used to log in recently...well that's been happening, except with other people's usernames and accounts. The password hasn't filled in automatically any of the times, but these strange usernames will be listed there and it's making me wonder what the cause of this is and if its potentially dangerous. There's no possibility of someone having logged in to any sites on this computer other than myself since I live alone and my computer is password protected...I'm the only one who's ever used this computer to my knowledge. So what could this be? These usernames do not ring a bell to me at all, and after googling them, the ones that do show up (most of them don't) will belong to people from across the country who I've never heard of. Could I have been hacked? Or have a virus? Or have had my identity stolen or my computer taken over by somebody else? Or is this just a common fluke or something? I'm not sure how paranoid I should be in this situation, but since I log in to things like my bank account with this computer it makes me nervous seeing these other usernames appear in the login fields. Another thing I should mention is that I have it set so that it automatically clears my cookies/private data whenever I exit Firefox...I also have Norton 360 installed and it's detected nothing out of the ordinary, even after multiple full scans. Thanks in advance for any help!!