I don't get terribly excited about new browsers very often. If it loads most pages, that's probably enough for me. But the new version of Firefox is just amazing. It is multiple times faster than anything I've used, and the plugins Just Work without any tweaking. Apparently it went out on my system and found plugins to use. I'm impressed.
This business of renaming it seems very odd, but, frankly, I don't care enough to think about it much more than to say that it's odd.