There's a chance that raymerjacque will see your post here and read it, but you'd probably have better luck at the Makulu forum. It looks like they're currently active here -
http://makululinux.discussion.community/It's generally possible to download the firefox tarball, unpack it in your home directory, and run it from there. Start it from a terminal, and if it doesn't work, you'll get error messages. Check with someone who knows makulu for an actual solution, instead of a work-around.