PopNot is an advanced pop-up advertisement suppressor that prevents annoying pop-up windows from appearing as you surf the web, with no need to set up for particular websites or keywords. Unlike most pop-up killers, PopNot prevents pop-up windows from ever appearing -- there's no need to wait while a new pop-up window appears and disappears; furthermore, it won't incorrectly close new browser windows or interfere with web navigation. It also features customizable functionality for advanced users.