Firefox

So I just updated to Firefox 1.5. Nice, simple.

First boo moment: my version of flashblock isn't compatible.

First yay moment: SVG support. (Although masking doesn't appear to be working correctly Apparently masking isn't implemented yet.)

SVG Tetris

Oooo. An SVG implementation of Tetris. That's too cool.

Firefox extensions

What Firefox extensions do you use?