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is the "Restart with asm.js core" button working?

Yes, with firefox 23 I pass from 6 MIPS to 90 (which I suppose means that there is some bug without asm.js, since it shouldn't improve that much).

This work is giving a new mean to "impressive"

Not a bug, asm.js is basically machine code, so it should run nearly at native speed.

Yes, at least for me on Firefox 23