Now using DPA2, and it isn't much different. The layout of the preferences is more Safari-ish. But general functionality is about the same. Except faster. I don't know how it managed that, but it is faster. Maybe it's just because network traffic has slowed down, and I'm getting like 500+kbps.
For anyone who's counting, my new /usr/local/firefox is only 21.5MB, which is less than half of /usr/lib/firefox-1.0.6. Still got all the themes and plugins. Need to update my search plugins, tho.