geckodriver Package Installation on Mac

About geckodriver : WebDriver <-> Marionette proxy!
More Information: https://github.com/mozilla/geckodriver
Steps:

  1. Launch Terminal by pressing command+space, type terminal and hit Enter key.
  2. Run
    ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
  3. Install
    brew install geckodriver

Done!