Facebook Goes After Greasemonkey Script Developer

palmerj3 writes "The popular Facebook Purity greasemonkey script (now renamed Fluff Buster Purity) has been used by thousands to rid their Facebook feeds from the likes of Mafia Wars, Farmville, and other annoying things. Now, Facebook is threatening the developer of this script. Does Facebook have the right to govern their website's design and functionality once it's in the browser?"