plain-youtube-controls
Some useful things using Youtube Player API
Quick overview
Interface provides two simple and helpful options:
Besides the fact that you have autoreplay feature, you could enable maximum resolution by default for all your videos.
Bonus
Sometimes it happens that you're in the middle of a two-hour presentation (letsplay, training course)
and in a one moment, you could see that annoying screen. Wi-fi connection was lost for a second:
Don't worry, you don't need to refresh the page, rewind and find the timestamp.
This extension will make it for you!