I’ve been running 3 RCs for some time. I didn’t even realize last night when it told me there was an update that it was to the final.
I use both Safari and Firefox and often have both running at the same time. Safari supports services which I use all the time and its page search is killer. For web work I usually use Firefox.
If you haven’t already you’ll probably want to go to about
:config in Firefox and switch this to false as I have.