When running Aero, the tabs in FF 2 are bloody awful - it's too hard to tell where the tab boundaries are because they're all gray. So I was poking around extensions and came upon Colorful Tabs[^], which makes each tab a different color. Right now I have 4 tabs and they are gray, green, pink, and red. Nice!
But then I had the problem of not being able to tell which tab was the current one. Sure, the text is bold but that isn't easy enough to spot at a glance. So I added this to my userChrome.css: