homebrew-cask/Casks/firefox.rb

cask 'firefox' do
  version '43.0.4'
  sha256 'f984a275f978aaec7b66af860fbf9f74c457b173475429363cadb1bc6e3c2be8'

  url "https://ftp.mozilla.org/pub/firefox/releases/#{version}/mac/en-US/Firefox%20#{version}.dmg"
  name 'Firefox'
  name 'Mozilla Firefox'
  homepage 'https://www.mozilla.org/en-US/firefox/'
  license :mpl

  app 'Firefox.app'

  zap :delete => [
                   '~/Library/Application Support/Firefox',
                   '~/Library/Caches/Firefox',
                 ]

  caveats <<-EOS.undent
  The Mac App Store version of 1Password won't work with a Homebrew-cask-linked Mozilla Firefox. To bypass this limitation, you need to either:
    + Move Mozilla Firefox to your /Applications directory (the app itself, not a symlink).
    + Install 1Password from outside the Mac App Store (licenses should transfer automatically, but you should contact AgileBits about it).
  EOS
end