language: ruby
os: osx
install:
  - brew tap jamesdobson/legacy-firefox

script:
  - brew cask install firefox-esr-45-0-2


language: ruby
os: osx
env:
  - FF_VERSION=52-2-1
  - FF_VERSION=45-0-2
install:
  - brew tap jamesdobson/legacy-firefox

script:
  - "brew cask install firefox-esr-$FF_VERSION"


Implement parallel test in Travis CI
Implement parallel test in Travis CI