Firefox: Greasemonkey

There’s a new Firefox extension out there called Greasemonkey, and it’s worth taking a long, hard look at.

Essentially, what it does is rewrite certain websites you visit based on downloadable scripts. Here’s a perfect example via a clip out of a recent Wired article:

“There’s a script targeting Amazon pages that lets you know if a book you are looking at on Amazon is available at your local library,” Pilgrim said. “Think about that. That’s amazing, and it happens automatically. You configure it once for your library, and Greasemonkey goes and gets the data.”