I have a message from Mozilla inviting me to update to FireFox 4.

If I am content with my FireFox 3.6.17, are there any compelling reasons for me to update? Or, as seems more likely, are there compelling reasons for me not to update?

I am not a fan of changing things just because they can be changed (which seemed to me to be the driving force behind XP --> Vista). I'm of the "If it ain't broke don't fix it" school. Hell, I'd still be using Ami Pro for word processing if someone had ever ported it over to 16 or 32 bit. But, on the chance that FireFox 4 is really and truly wonderful and not to be missed out on, I thought I'd ask here.

tanstaafl.