javascript:var videoList = document.getElementsByTagName('video');
if(videoList && videoList.length){

	var videoPick = prompt('Which video? There are ' + (videoList.length) + ' Enter the number');
	var vidIndex = videoPick - 1;

	if(videoPick && videoPick <= videoList.length){

		var video = videoList[vidIndex];

		if(video) {

			window.lastCheckedTime = video.currentTime;
			setInterval(function(){
				if(window.lastCheckedTime == video.currentTime) {
					video.currentTime += 1;
					debugger;
				}
				window.lastCheckedTime = video.currentTime;
			}, 1000);
			alert("done");

		} else {

			alert("something went wrong");
		}

	} else {

		alert("no video");
	}

} else {

	alert("no video elements found");
}