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Greasemonkey

Greasemonkey is a Firefox addon that allows you to modify web pages.

You can do this by installing Greasemonkey, then any of the widely available 'user scripts' (or create your own). To help you install Greasemonkey and user scripts I recommend this How-To Guide [devilsworkshop.org]

Because Greasemonkey scripts are simply javasript files (with a few extra [very useful] API functions thrown in too), you can do pretty much anything you want -- maybe you want to grab data from a website and turn it into something more useful, or maybe you just want to change the way a website looks?

Whatever it is that you want to do, there's a pretty good chance that you can do it using Greasemonkey!