Script Summary: Youtube logged only.
Copyright: 2010+, REVerdi (http://userscripts.org/users/67570)
License: (CC) Attribution Non-Commercial Share Alike; http://creativecommons.org/licenses/by-nc-sa/3.0/
I always forget to login on YouTube before to watch a video. So I lose the history of the videos that I watched and I do not generate statistics for my user. With this script I will not forget to login before watching any video.
>>> TESTED ONLY ON FIREFOX <<<