I know for certain that there are previous non-asm.js optimized builds of Firefox that run it fine (with a performance penalty, naturally.) Chrome currently cr

I know for certain that there are previous non-asm.js optimized builds of Firefox that run it fine (with a performance penalty, naturally.) Chrome currently crashes because Chrome can't handle enough variables per context. This is a bug with V8 that is allegedly getting fixed. It wouldn't surprise me if mobile support is currently minimal to none though; but this is something that can and almost surely will change independent of asm.js optimization support. (And this is the Unreal demo specifically - smaller projects should be supported by virtually any modern browser* as far as I know.) * Caveats: IE doesn't support WebGL, etc.