Hello. I was on a website the other day and all of a sudden there was a warning that came down from the top of the browser. It was a grey warning box. Said something like your computer has a virus or is infected, etc. and will be checked for the virus. I could click on "ok" or "cancel". I clicked cancel but there was a green progress bar that started to show that a download was taking place. I forced quit right away but when I opened firefox it gave me the webpage again with the warning. I hit cancel again and the same thing started to happen (showed a download in progress with a green progress bar on left side of screen). I immediately closed all the firefox windows I had open. When I clicked on firefox again everything was fine. The new window went to the apple website page and everything seems to be working fine. I use a mac. Has anyone else gotten this warning before? And should I be worried that my computer was infected by a virus? I don't have an anti virus installed on my computer. With mac I always just keep the security updates up to date and I'm usually fine. I just want to make sure my computer didn't just get a virus. Thanks for the help!