class Selenium::WebDriver::Remote::Capabilities

def process_capabilities(key, value, hash)
  case value
  when Array
    value.map { |v| process_capabilities(key, v, hash) }
  when Hash
    value.each_with_object({}) do |(k, v), h|
      h[convert_key(k)] = process_capabilities(k, v, h)
    end
  when Capabilities, Options
    value.as_json
  else
    convert_value(key, value)
  end
end