Firefox said Firefox Quantum is over twice as fast as Firefox from 6 months ago. It is built on a completely overhauled core engine with brand new technology. Its features:
Uses less memory
Surf a ton of pages
Open a zillion tabs
....
Source: https://blog.mozilla.org/blog/2017/11/14/introducing-firefox-quantum/?utm_source=twitter&utm_medium=social&utm_campaign=quantum-launch-2017&utm_content=launch-blog
