That's all they do. They're running some weird setup, and they've made like three hundred posts complaining that games don't work for them, as if it's on the individual game designers to fix instead of their problem.
How exactly is that a weird setup? And to be honest I don't care much if the games run. But the game jams are supposedly for feedback and if one of literally three major browser engines are not supported, then it's an issue to be reported.
Edit: To be fair, it seems to work fine on my firefox.
Yeah, that's the thing. The games generally work fine on Firefox. They just don't work for this clown, and they refuse to admit the problem is on their end.