It's true! It really works! I've been using it for awhile. Read all about it and then if you're interested download it here! Don't forget to set your preferences once it is installed: "Web surfers can turn on the pop-up stopper in Mozilla 1.0 by clicking on their edit menu and selecting "preferences." In the advanced menu window, under "Scripts and Plugins," people must uncheck the "open unrequested windows" checkbox. Then click 'OK.'" edit: Though Mozilla does get rid of pop-up/pop-under ads, it is noticeably slower than IE, but can be used anytime you just want to browse the web without any distractions and don't mind the slowdown. As far as I know, the slowdown is not really noticeable on Macrumors, so it is fast on some sites.