Does its job pretty well. One downside, if you pause a video and come back hours later to r###me it, so that YouTube must "reload" the video player, the quality setting switches back to auto. Or at least it did as of the last version; I haven't had the latest version long enough to know whether it still does this.

In theory this should already be handled, but I probably haven't really tested this case. I will try and see if I can reproduce on Firefox.

Good luck. I can confirm that it still happens in Chromium browsers. To elaborate, if you pause the video and leave the tab alone for a few hours, when you try to r###me playback, it only plays for a few seconds, then goes black and shows the loading animation, then starts playing again. That's what I mean by reloading the player. At that time, the quality setting returns to auto.