if I visit http://www.drudgereport.com/ it shows a pop-up window. Only seems to do it on first visit, but I though firefox was meant to prevent pop-up ads?
Mine just comes up with the yellow bar at the top "Firefox blocked this page from displaying a popup..."
No popups here... check you havn't told firefox to allow popups from that site. Also: Adblock. I get two counts of blocked ads on that page.
Firefox is very good at stopping pop-up's but there has been a recent bug/exploit that allows pop-unders in firefox. Since that was found out there have been a splurge of pop-unders on the interweb.