So did i get you right that you was surfing with FF and a pop-up showed in IE? That would be rather strange.
But pop-ups that are hard to close happen from time to time, especially that LiveJasmin-stuff with embedded content can sometimes freeze your browser (only talking about FF, don't use IE) for some time. Maybe changing the size of the browser cache or installing the newest versions of flash, etc can help and of course configuring java and javascript (what a script may do and what not)
Of course one gets nervous if something is behaving strange, but since you have an antivirus software installed, you should be on the safe side.
If your experience that problem again, maybe remember what imagehoster it was so we can have a closer look.
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