Youtube UnHooked

Do you find yourself getting hooked by Youtube's recommended and related videos, but you don't want to deprive yourself completely of Youtube?
This extension still lets you search and play videos, but hides the parts of Youtube that are unneeded and addictive: the front page recommendation feed, the related videos in the sidebar and end screen, and the comments.

(Note: if you only want a subset of those things hidden, try HabitLab by Stanford)