"Greasemonkey is a browser extension lets Firefox users write and install scripts that change Web page features on the client side. There are thousands of such scripts available; most of them are pretty trivial, but if you dig deep enough you can find some good ones. Recently I looked at some that help improve the Gmail experience. Recently, I found four more useful scripts: a couple for eBay, one for the Internet Movie Database, and one for online shoppers.
"If you've ever been burned on eBay by a seller with less than stellar feedback, chances are that the first thing you do before bidding is check for negative feedback..."
