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Just came here to say the same thing, sounds interesting but I bounced soon as I couldn't view outside of fullscreen.

Agreed, that was very strange. Right click "Copy video link". Leads me to - https://www.youtube.com/watch?v=Gy5m091fOTU

As a quick fix, I've put there a direct link to that video.

I think you should just turn off the forced full screen. No reason to have it at all.