We had one of these threads back in '04. Things have changed a bit since then. Basically, what are your extensions that you use, and what are your favorites of them. Here's mine: The top two sections are "have to have". From the bottom, Colorful Tabs, Download Statusbar, Gmail Notifier, and Smilet Xtra would be great recommendations. Well, all of them are, actually. Personas for Firefox is pretty neat. It lets you choose skins on the fly that you don't install. Choose one and it downloads and displays right them. Pretty neat.