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I can't seem to find a link to this in action. I just find two blog posts about it.

That's not actually it. It's a sorta mashup of that, Khan Academy and Wikipedia, facilitated by Popcorn.js

Oops! Sorry! :)

Same, it seems they lost the link to the actual demo and just keep linking back to this blog post: http://mozillapopcorn.org/popcorn-in-the-planetarium-demo/ :(