PopOff! - Version 2.03 PopOff! just got a whole lot better with v.2. Now choose your own filter strength. Unlike other popup killers, there are no lists for you to maintain. CPU hungry Visual Basic programs work by quickly closing the window after it opens. Not with PopOff! - these extra popup windows will never open. PopOff! runs automatically in the background, starting up when you start your IE, Netscape or Opera web browser. Best of all, its free!