capybara w/selenium and proxy config

capyseleniumproxy.rb

Capybara.register_driver :selenium do |app|
  profile = Selenium::WebDriver::Firefox::Profile.new

  profile["network.proxy.type"] = 1 # manual proxy config
  profile["network.proxy.http"] = "localhost"
  profile["network.proxy.http_port"] = 8080

  Capybara::Selenium::Driver.new(app, :profile => profile)
end