Thats funny. When I use firefox most sites break up the format on me.
I would post an example, but the server is in maintenence.
There are others, but I dont feel like searching for them.
Also, because I'm on a slower computer, I cannot run Firefox without my 3d applications slowing down excessivly. It seems to use quite a bit of memory.
I also find Firefox crashes a lot more often than IE, but atleast in Firefox you can restore your session. (while sometimes that's the problem, one of the pages is crashing it)
Whether something is good or not is up to the user, this is just my experience.