I use Firebird and The Proxomitron. Proxo has pop-up blocking options that work well, although the biggest advantage for me is ad-blocking and keeping those annoying sounds/music from playing that are embedded in webpages.
EMS Free Surfer mk II bottom line this is the best pop up stopper around.
this baby was out way before the others. no fancy commerical crap. very nice app. best of all its freeware, here is the link http://www.kolumbus.fi/eero.muhonen/FS/Index.html