testing firefox nightly - crashy foxy 3.1

on my ubuntu intrepid ibex 64 i wanted to test the new jit things
http://ejohn.org/blog/tracemonkey/

wget http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/firefox-3.1a2pre.en-US.linux-x86_64.tar.bz2
cd firefox/


./firefox

enable the jit

javascript.options.jit.content true

then do some tests

http://people.mozilla.com/~schrep/image12.html