I was browsing around on some blogs earlier and a popup managed to slip past firefox's built in pop-up blocker. Of course it was one of those rather shady "adult" pop-ups that seem to be popular with most advertisers. I quickly closed the window, to avoid any embarrassment since I had family members in the room. On windows this would prompt me to do a virus scan to make sure no baddies managed to slip onto my system. But I do not know of any free reliable virus scanner for mac, and since it did not prompt me to approve any changes to my system when the pop-up came up. I thought nothing of it. But the old habit is nagging me, and I need to know if there should be any cause for concern. The thing that is bothering me is how exactly did the pop-up get through adblock plus AND firefox's coded defenses. Also after the initial pop-up got through and I closed it, I noticed that the page that had the pop up would flash when I would click on any of their articles, as if it was refreshing or running script to bring up another pop-up. So what do you think?