Description: Free Pop Stop from BestToolbars.net can block 100% annoying pop-up and pop-under ads automatically while never interfere with your navigation. It is small, freeware and easy to install. Unlike most pop-up killers, there's no need to designate particular websites or keywords - it works without human intervention; - it only blocks unsolicited pop-up windows while does not in any way interfere with opening new windows!