From April 15th, 2012 to April 8th, 2014, 33% user give 3-star rating, 67% user give 2-star rating. for keySharky chrome extension.
As of March 2014, it still only works if the tab is open and has focus. I'm uninstalling. I needed a way to play/pause/next/prev from anywhere in windows.
Only works if the tab is open and has full focus........
No global hotkeys.