Very nice, since it let me replace 2 of my old Addons:
- "YouTube ALL HTML5" (which recently stopped working for me and removed the youtube video entirely, leaving only a black rectangle in its place)
and
- "FlashStopper" (which despite the name also stops HTML5 videos but was causing some issues on other websites besides youtube for me)

Now I can load a video in a new page, have it automatically paused with the thumbnail showing until I press play and it starts loading. Also lets me make the videos default to cinema mode and 1080p.

So all in all it has all I need.