It appears it can't find a lib file:
Code:
crashedagain@Desktop:~$ /usr/lib/iceweasel/firefox-bin
/usr/lib/iceweasel/firefox-bin: error while loading shared libraries: libmozjs.so: cannot open shared object file: No such file or directory
this file IS present in /usr/lib/firefox/
I have since installed both swiftfox and iceape and both work. Just firefox is giving problem.