I upgraded to Mozilla Firefox 0.9.1 (Windows users should skip to Firefox 0.9.2; there's a malicious URL bug in 0.9.1). I like the new extension and theme stuff. Since, I spend a fair amount of time reading the Something Awful Forums, so I grabbed the Something Awful Forums Menu and Something Awful Last Read Enhancement extensions (note: these links may not work if you're not a Something Awful member). Speaking of Firefox extensions, here's a good tutorial for writing them.