Unreal Engine 3 in Firefox with

The Unreal Engine 3 JavaScript port, showing off the Epic Citadel demo as well as the Unreal Tournament 3 “Sanctuary“ level, played in a Firefox Nightly build. An engineering team from Mozilla and Epic completed the majority of the port in just 4 days, using Emscripten. The near-native performance is thanks to , a backwards-compatible JavaScript subset. For more information, visit , , and .