The new Firefox is here: Firefox Quantum is over twice as fast as Firefox from 6 months ago, built on a completely overhauled core engine with brand-new technology and graced with a beautiful new look designed to get out of the way and let you do what you do best: surf a ton of pages, open a zillion tabs, all guilt-free because Firefox Quantum uses less memory than the competition. The first thing you’ll notice is the speed. Go on, open some tabs and have some fun. The second thing you’ll notice is the new User Interface (UI). We call this initiative Photon, and its goal is to modernize and unify anything that we call Firefox while taking advantage of the speedy new engine. We also made many, many performance improvements in the browser’s core and shipped a new CSS engine, Stylo, that takes better advantage of today’s hardware with multiple cores that are optimized for low power consumption.