The main thing I wanted was to hide annoying or distracting elements of the YouTube User Interface. This plugin does all that and more.

I've set comments and related videos to be collapsed by default for instance. I also saw I can turn off channel trailer autoplay, thank the gods.

Some elements aren't working like hiding likes. But hey it's free, I can't complain.

A neat feature is a very granular playback speed option, so you can play back videos at 1.1x speed for instance, or up to 8x speed.

Thank you to the developer. This greatly improves my experience of YouTube.