Chrome //
Extensions 
Chrome
Web store 
YouTube™ No Buffer - Stop Auto-playing
Prevents YouTube HTML5 and Flash players from auto-buffering (auto-playing) videos
Stop AutoPlay Next for YouTube™
Stop YouTube from playing the next track, and auto navigate to the next suggestion (aka disable autoplay button)
YouTube - Don't Stop
Remove the 'Video paused. Continue watching?' popup & 'Get it now' Youtube Premium popup ad. No frills & efficient.
YouTube™ Stop Button
Adds a stop button to the player interface to unload the player and stop the video from buffering any time.
