From April 28th, 2013 to May 17th, 2018, 33% user give 5-star rating, 67% user give 1-star rating. for Now Playing Pop-up for YouTube™ chrome extension.
I can't get this to do anything :( Edit: Works on normal YouTube No longer works with 'Try out a fresh look for YouTube' enabled from TestTube: https://www.youtube.com/testtube :( Notifications don't pop up. 05/13/17
As of August 2016 it doesn't appear to work. Would love an extension like this that does.
I'm very happy to find this extension for breezing through playlists in conjunction with media keys! However, I wish that there was a window to change how long the window lingers, but otherwise, exactly what I needed!