How to easily adjust video speeds on one click

Add the following line to your bookmarks, as if it were a URL.

(One way to do this is to press Ctrl+D to bookmark this page, then right click the bookmark and click Edit, then change the URL).

javascript:(function(){var speed = prompt("Enter speed"); if (speed) document.getElementsByTagName("video")[0].playbackRate = speed;})();

Now, if you’re watching a video on a website that doesn’t let you change the speed (like Facebook), just click on the bookmark and enter the desired speed as a number (i.e. 1=original speed, 2=twice the original speed, 1.5=50% faster than the original speed, etc.).