class Selenium::WebDriver::Firefox::Driver

def devtools_url
  if capabilities['moz:debuggerAddress'].nil?
    raise(Error::WebDriverError, 'DevTools is not supported by this version of Firefox; use v85 or higher')
  end
  uri = URI("http://#{capabilities['moz:debuggerAddress']}")
  response = Net::HTTP.get(uri.hostname, '/json/version', uri.port)
  JSON.parse(response)['webSocketDebuggerUrl']
end