This software is your best solution to stop unsolicited pop-up windows, including those that are initiated when you leave a site! There's no need to designate particular Web sites or keywords, it works automatically without user intervention. The program will never interfere with new windows or user navigation.

PopupStomper is a popup ad blocker that improves browser performance and usability by suppressing the download and display of ad images and/or popups. The program tightly integrates with Internet Explorer and runs automatically and invisibly as soon as you start your browser. 100% of ads are blocked via automatic detection, not a pre-defined (outdated) list. User control for approved popup pages. A must for every web surfer who has been irritated and inundated with those annoying popup windows.

The download is small and fast; the software runs unnoticeably in the background. A very worthwhile addition for anyone who's seen one too many advertisements.

Based on simplicity, efficiency and ease of installation/use: