NCommander had a multi-part stream of building LFS up to Firefox. He's gotten up to building Xorg and the Firefox prereqs so far. I don't know when he plans on doing the final push to building Firefox.

Part 1: https://www.youtube.com/watch?v=tCh0XjyIAKU

Part 2: https://www.youtube.com/watch?v=egzyIFsQ3Nw

He also managed to dig up a copy of the proto LiveCD of Yggdrasil Linux and get it working.

https://www.youtube.com/watch?v=Cynd0guSUvM