No not the fist but the grease.
Last July, I foresaw a thousand client side page hacks blooming. This was motivated by Adrian Holovaty writing a Mozilla extension to rewrite AllMusic. Adrian's at it again with a compiler for Grease Monkey scripts to pure Mozilla extensions, Python inside no less. That is a moby hack.
Ben Hyde is entertaining himself documenting all the mayhem that Grease Monkey is causing.