It seems the speed can be set for the current video using:
document.querySelectorAll("video")[0].playbackRate="1.5";
However, YouTube may not do a full reload when it changes videos, so there would need to be some code watching for when a new video loads.
Bumping in the hope someone can help :)
Works PERFECTLY. Thank you. :)
Request: Script that automatically plays Youtube videos at 1.5x speed.
Simple request for a (hopefully) simple function. I'd like a script that will automatically set youtube videos to play at 1.5x speed in the HTML5 player.