Firefox for Android

before start...
install yasm
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Yasm

install cask
https://github.com/caskroom/homebrew-cask

if you want to use git instead of Mucrial
https://github.com/glandium/git-cinnabar


if you have any problem ,try below and do again
hash -r python

Follow below instruction to build Firefox for Android!
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Firefox_for_Android_build