Pop-Up Stopper

From Panicware:

Block Netscape, Internet Explorer, Mozilla and desktop pop-up windows with the latest upgrade of this small tool, now with added support for Mozilla, and new technology to block annoying Messenger Service and GAIN adserver desktop ads! No need to adjust proxy settings, or add sites to a list. Pop-Up Stopper will not strip web images or slow your browser. You can allow pop-up windows only when you want them! User settings allow various pop-up notifications, such as a flashing icon or new, fun sounds. Simply hold down Control (CTRL) or Shift key to allow selective pop-up windows, but most new links should now open automatically! Pop-Up Stopper is not advertising supported, nor does it require registration, and no information is collected from or about product users. Pop-Up Stopper is very small, and easy to use. Complete with full Install and Uninstall, and a complete setup wizard and online help file, and free unlimited tech support.

The latest version includes automatic updates, new ad-blocking technology, easier user interface, more sound and visual notifications to play when an ad is blocked, and a full online help database.