Comment 25 for bug 576991

situations improving on lucid used to be having to restrict the version of xulrunner to get things to work now its simpler
 as harry said in the duplicate (he made a link to the version in xulrunner-1.9.2.8)
As a workaround, I made a symlink to /usr/lib/xulrunner-1.9.2.10/libmozjs.so in the directory /usr/lib/
Now gnome-shell loads OK.
wonder if it will break again on the next update - least ways now gnome-shell doesn't get uninstalled on upgrades which i found happening previously.