I just installed about 10 extensions in FireFox. I found some neat ones like the weather rank and others. Here’s yet another PageRank tool I found that puts the PR and the Alexa rank in your status bar.
The other cool FireFox extension is FoxyTunes which allows you to control your music player from within the browser. I have mine set to control iTunes and you can do just about everything with it.
The last cool extension I have to tell you about is called ColorZilla Color Picker. It’s basically a copy tool that can pick a color off a page in your browser and you can paste it into wherever you want.