ytma! automatically converts YouTube(TM), Vimeo, Vine, Soundcloud, WebM, and MP4 links into real embedded videos.
You should be able to see some youtube link converted to a video thumbnail in this page http://www.neogaf.com/forum/showpost.php?p=28215116&postcount=2
Can you provide some tests links ?
I want test you script, but it is difficult to find some links where it work.
Can you provide them ?
Request:
Can you add an little icon near Videos when your script is in action?