Thanks SlowNeasy for sending this in.
"Proxomitron features a powerful HTML text matching engine able to dynamically alter web pages on the fly. Works with any browser to eliminate cyber-spam like pop-up windows, alerts, banners, animated GIFs, auto-play music, sounds, dynamic HTML, and more. Replace background images with your own, rewrite JavaScripts, even filter normally hidden HTTP header messages. Over 50 filters are included, and equally powerful filters can be created. Selectively replace most any HTML text or tags. "