This is a must have add-on for anyone who uses YouTube more than twice a week. It just makes life a lot easier by always applying your preferred settings for volume level, playback speed, resolution, full screen/ theatre mode/ expanded mode, dark/light mode or custom themes, and all sorts of other stuff. I feel like it's pretty much mandatory to have this add-on for anyone who watches videos on YouTube at all. I hope that everyone who reads this has an absolutely wonderful day! :)