gem install bundler
bundle install
bundle exec ruby firefox.rb
/usr/local/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.0.0.beta3.1/lib/selenium/webdriver/remote/w3c_bridge.rb:79:in `initialize': unknown option: {:profile=>#<Selenium::WebDriver::Firefox::Profile:0x007f95d39ea050 @model=nil, @native_events=false, @secure_ssl=false, @untrusted_issuer=true, @load_no_focus_lib=false, @additional_prefs={}, @extensions={}>} (ArgumentError)
from /usr/local/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.0.0.beta3.1/lib/selenium/webdriver/firefox/w3c_bridge.rb:34:in `initialize'
from /usr/local/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.0.0.beta3.1/lib/selenium/webdriver/common/driver.rb:49:in `new'
from /usr/local/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.0.0.beta3.1/lib/selenium/webdriver/common/driver.rb:49:in `for'
from /usr/local/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.0.0.beta3.1/lib/selenium/webdriver.rb:82:in `for'
from firefox.rb:3:in `<main>'