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Unreal Engine 3 Running in Firefox with asm.js

Firefox · Demo · 3 min · 2013 · YouTube title: Unreal Engine 3 in Firefox with asm.js
Why it's here

HN cites it as proof of how capable browsers became, a landmark for asm.js and WebAssembly.

What it covers

Mozilla's short demo of Unreal Engine 3 running in Firefox, ported by Mozilla and Epic in four days using Emscripten and asm.js.