[py]: Document firefox `service=` arg. closes
@@ -88,6 +88,7 @@ class WebDriver(RemoteWebDriver):
binary to use for Firefox 47.0.1 and greater, which
defaults to picking up the binary from the system path.
:param options: Instance of ``options.Options``.
+ :param service: (Optional) service instance for managing the starting and stopping of the driver.
:param service_log_path: Deprecated: Where to log information from the driver.
:param service_args: Deprecated: List of args to pass to the driver service
:param desired_capabilities: Deprecated: alias of capabilities. In future
