Rated 4 out of 5 stars
This add-on has a lot of potential.
Here's a few thoughts for future improvements:
Make the button on the media site optional, make it have a toolbar button. Also add a tutorial on how to integrate it with Firegestures, that would be brilliant.
Additionally, would be lovely to have a, so to say full-lights-out-mode where only the media is shown centered horizontally and vertically and the rest of the site is blacked out.
Keep working, g' luck.