I just tried out a nightly build of Fennec from: http://ftp.mozilla.org/pub/mozilla.org/mobile/nightly/
and it actually was usable than when I tried the whatever build that came out a few months ago.

Startup didn't take 30+ secs and I was able to browse websites this time. It still has issues with the virtual keyboard and it crashed my tablet least once, but least I could "preview" it this time.