From April 17th, 2016 to November 6th, 2017, 67% user give 5-star rating, 33% user give 1-star rating. for Fullscreen Fixer chrome extension.
Did not work.....hated it.
This fixed YouTube not going fullscreen Thanks!
Not being able to add full-screen to particular sites was bothering me, thanks for the fix. Only wish I could manually enter the exceptions but at least this gives a way to add them in.