here's a guide to building the qt version which has always been faster

http://developer.mikek.dk/#post50

one thing i'm very interested in is html5 video. fennec on the n900 seems to be the only version/platform which allows gstreamer as a backend, which means we can play h264 or webm html5 videos and not care who wins the webm/h264 format war.

but to enable gstreamer support you need this line:

ac_add_options --enable-gstreamer

in your mozconfig file before compiling.