0:03.02 TEST_END: ERROR, expected PASS
UnknownException: TypeError: this.curBrowser.curFrameId is null
stacktrace:
	GeckoDriver.prototype.getWindowHandle@chrome://marionette/content/driver.js:1301:3
	despatch@chrome://marionette/content/server.js:557:20
	async*execute@chrome://marionette/content/server.js:531:11
	async*onPacket/<@chrome://marionette/content/server.js:506:15
	async*onPacket@chrome://marionette/content/server.js:505:8
	_onJSONObjectReady/<@chrome://marionette/content/transport.js:500:9