QUOTE(Superstitious)
I haven't had these issues and I'm on FF 99% of the time.
You'd have to specifically have the Firebug extension to be experiencing the problems.
QUOTE(doublehelix)
kinda similar to what you can do with Opera, although, what causes it to go buggy, after you edit the html live?
It seems that just simply having the extension active, yet doing nothing with it, will cause Firefox to crash. It must be disabled to navigate the site. I've also seen that firebug will also slow down gmail if it is active while on gmail. You need to change some settings in gmail to keep it active.