Firefox Extension bad word filter

[chasebadkids]

Does anyone know where I can find a firefox extension to install that would filter out bad words on a page? Ive searched up and down and cant find any, or does anyone here happen to know how to code one?

let me know.

Thanks =]

[projectx]

ProCon is a content filter for the Firefox browser, based on BlockXXX (by Tom Christensen). ProCon filters any type of web pages, but if left on default it limits itself to filter pages containing explicit content automatically, based on the text. ProCon can also censure any single word, and create a WhiteList.
see: http://procon.mozdev.org/
http://www.tidus4life.altervista.org/procon/images/screen1.png