for those who don't know, you can customize Firefox (henceforth FF) to it's fullest. different themes (which include border colors, custom menus and buttons, etc...). extensions are sub-programs that run while FF or thunderbird is running.
click tools, then themes (or extensions) and bottom right, click get more ...
here's what i have, with a short description
Firefox 1.6
Black Japan theme
Talkback - Mozilla crash reporting
IE tab - allows IE only pages to load in FF with a simple click
Forecastfox enchanced - on the bottom right of any FF window, a radar and forecast icons show the current and future weather
ChatZilla - the FF IRC chat client
Google SafeBrowsing - checks websites for phishing or fraud
google Send to Phone - text message people's phones
Blogger web coments[/b - lets me see what people write about this site (appearantly i have one for SimV)
[b]Foxytunes - allows me to control Itunes (or any media player) via a control menu in FF.
Mouse Gestures - instead of clicking buttons to refresh, go forward, go back, close tab, etc... i can draw certain lines to do this.
Thunderbird:
Black Japan theme
talkBack
Foxytunes
Mouse Gesturesramos