As someone who has been using Mozilla since ~M14, it disappoints me greatly to say I might have finally found something better.
I've been toying with Phoenix/Firebird/Firefox for awhile (I think since around Phoenix 0.3) but it never really did it for me. I've been using Firefox for about an hour now, and I really enjoy it. I highly recommend everyone gives it a try. I don't know if I'd install it on my family's home computer yet, but it's getting pretty darn close.