With its asm.js project, Mozilla is promoting a subset of JavaScript intended to improve Web application performance and extend C and C++ applications to the Web.

We put Mozilla's JavaScript subset—asm.js—to the test. Ars Staff - 5/22/2013, 6:00 PM Aurich Lawson / Thinkstock 167 In a bid to make JavaScript run ever faster, Mozilla has developed asm.js.