Examples:http://www.youtube.com/watch?v=VJ1dYrjuYf4http://www.youtube.com/watch?v=Wu3j3Qh7sTEThis happens in all my browsers (some which doesn't have any extensions installed).Why does this happen?
Why do some youtube videos repeat by themselves?
youtube
YouTube users can loop their videos by abusing the annotation system, specifically the pause function. If you turn off annotations when viewing the video, you will notice that it no longer loops.Tutorial: http://www.youtube.com/watch?feature=player_detailpage&v=48OaDaFG1Y0