I've got the old ff3 beta sitting in one of my VMs, but I'm still using firefox2 for general use.
I don't have the patience to sit down and find my way around another browser with all the other shít I have on my plate at the moment. :/
They did install automatically for me too yesterday on PC here though. Maybe it's not working 100% because of busy mozilla servers, not sure how it works but I had to go direct to the developers website to install the add-ons when I first installed it on release day. The add-ons dialog was just giving me a busy hour glass. What the heck is that new circle thing called in Vista now? It's not an hour glass anymore.
I am download firefox3 in my system. It perfectly works well in my system. It is a fast web browser. Memory leaks and other performance problems found in earlier version of Firefox is removed in this version.Text and image rendering have also been improved. It introduces a new visual language to the browser security game. It also have several features. So you can download this version just now..................