I run FF on a laptop with Vista and wireless connection. Midrange HP, nothing special and it runs as well as my desktop thats on high speed cable.
No problems with Vista for me.
I ran vista business edition for a week. I really really do not like it. It has all kinds of problems with drivers with my hardware and such (decent system, a64 3000+, geforce 6600gt, sound blaster audigy 4). Like it all works, just not nearly as well as XP.