Cross-tab keyboard control of youtube video and playlist playbackCtrl+\ to toggle playback
Ctrl+] next in playlist
Ctrl+[ prev in playlist
yes it CAN access:
Your data on all websites
Your tabs and browsing activity
But NO data is accessed or stored by the scripts. I only need to access all the tabs and their pages to append a keyboard listener. Inspect the source if you like =)
*update: working on a shortcut to loop current song in the playlist.