I was looking for images of various PDAs on Google. One of the images obviously resided on a sketchy site, since I got a popup window saying that a I had a virus (or somesuch) and that I should scan my computer. I encountered a few windows in my tale of woe, so I can't recall whether this first one was an actual Windows window or one of those windows that are part of the webpage. When I tried to close the tab, I got two popups (I think they were real Windows windows). One asked for permission to download and exe file while another said that the web page wanted me to confirm that I actually wanted to navigate away from the page. The latter, I've seen before; the former, well that's obviously malware. However, I wasn't confident about any windows anymore. What if I clicked on the Cancel for downloading the exe, but it was a phony Cancel that actually downloaded the exe? What about the confirmation to navigate away, is there a way for malware designers to fake such a window so that if I confirm, it will actually do something else? And what if the answers to both were "no" as far as anyone knows at present, but it is theoretically possible for the answer to be "yes" (which means that it will likely happen at some undetermined time in future, given the resourcefulness of people)? Because of this last possibilty, I figure that best possible way to close such a tab is for a browser to allow the user to tyranically close a tab without any questions or confirmations. I don't want to the firefox window because I have other tabs that want to retain. (I'm not even sure it would been allowed to go ahead in the presence of the popup windows). I don't quite recall, but I might have killed the firefox process in the task manager, but if I restart firefox and restore tabs, the bad tab will also be restored. So is there a way to forcibly close a tab, no questions asked?