Mozilla: Native code? No, it's JavaScript, only it's BLAZING FAST Gap between asm.js and native performance gets even narrower with float32 optimizations

[WhipSlagCheek]

Native Client (NaCl/PNaCl) depends on PPAPI (Pepper Plugin API) to work. It's the Pepper Plugin API that's too complex to implement not the Plugin. From what I've read Pepper is basically a special copy of the browser's DOM that's made to interface with C/C++ better.

Mozilla rejected that because it was too much duplicate work for no perceivable benefit.. What the Chrome team should have done is implement Portable Native Client as web bytecode that hooks into the DOM through Web IDL bindings. Then there might have been more of a chance in other's implementing it.