The wave of change isn't limited to under-the-hood improvements, Firefox 57 now features the Photon UI. The second thing you'll notice is the new User Interface (UI).
Firefox Quantum also benefits from a new resource allocation mechanism that was added in together with Stylo.
Mozilla is calling the Firefox Quantum visual redesign Photon. In a browser speed test video that Mozilla posted to the site, the new Firefox beat out Chrome in loading a few big name websites like Yelp and Shutterstock as well.
Mozilla today announced the public release of the latest update to its Firefox browser called Quantum boasting that it's twice as fast as the previous version of its open-source browser. The new engine has been parallelized and should be substantially faster, and Mozilla believes it can use its new Servo engine to enable capabilities like mixed-reality support far more easily than would've been possible in the old version. The most significant change is the introduction of a new multi-process architecture that allows code to run in parallel and improves memory consumption.
The Photon UI has also been streamlined compared to previous versions of Firefox, and is created to provide smooth and fast performance when browsing your favorite websites.