Stop-the-Pop-Up Lite is a free pop-up blocker preventing all annoying pop-up windows from appearing as you surf the Web. The pop-up stopper has full support for both pop-up and pop-under ads and will kill them even before they appear on the screen. Each time a pop-up is closed you will hear a cute sound effect. To allow pop-up windows, you can temporarily disable the pop-up killer by holding Control, Shift, or a. Another Stop-the-Pop-Up Lite feature is its ability to kill all pop-ups from file-sharing programs as well as from the spyware and adware that is bundled with these peer-to-peer programs. Stop-the-Pop-Up Lite supports Kazaa, Kazaa Lite, Morpheus, Grokster, iMesh, Xolox, and Direct Connect.

Stop-the-Pop-Up Lite also will kill the new breed of pop-ups called Messenger Service spam. Messenger Service pop-ups can spam you even when your browser is closed. Stop-the-Pop-Up Lite recognizes and kills hostile ActiveX controls from companies known to develop spyware or adware.