Firefox add-on that opens YouTube videos with a native player

Put this together today after getting fed up with YouTube's crappy player. It removes the player from any YouTube page and instead plays the video mpv. It also supports playlists if that's your sort of thing.
Demonstration
Source code and install instructions
Hope someone else finds this useful.

SirCmpwn wrote:mpv doesn't work well with a lot of videos, especially DRM'd ones. I originally made it go straight to mpv, but switched to the youtube-dl solution later.
Ah, I've not yet had that problem. What exactly are the youtube credentials used for?

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