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Well, I've been trying to see how this works and I can't find anything

Network monitoring on the browser shows nothing (maybe an anti-debugging technique)

tcpdump shows an SSL connection to EC2

You really can't synchronise so many people (especially with connection latencies), I think there's some amount of faking in it.

You can debug the Websockets connection fine in Chromium. I think Firefox doesn't show websockets frames though.

Ah I see it now (at least one stalled connection, but I guess that's how it works)

Here's the full (nicely formatted) source code, that I put together when the button was new and shiny: