The next Firefox Nightly build should get 84% on that page, much closer to Edge than Firefox 44 (74%).<p>I work on SpiderMonkey and I&#x27;m super excited about this news. All JS engines have added more-or-less similar performance optimizations but often implemented differently and I&#x27;m really interested to see what the Chakra team did. I&#x27;d be happy to write a blog post on it next month, if people are interested.