This was an april fool's joke from last year: http://badassjs.com/post/202942384...

MatthewPhillips on March 27, 2013 | parent | context | favorite | on: Mozilla and Epic Announce Unreal Engine for the We...

This was an april fool's joke from last year: http://badassjs.com/post/20294238453/webkit-js-yes-it-has-fi...

In the non-joke category, Mozilla created a JavaScript interpreter written in JavaScript (to test new language features): https://github.com/mozilla/narcissus/