It's FOSS - https://itsfoss.com/firefox-quantum-ubuntu/
Brief: The game-changing Firefox Quantum is here to reclaim the lost userbase. Here’s how to install Firefox Quantum in Linux right now.
The latest version of Mozilla’s web browser Firefox is called Quantum because it’s blazing fast. It has been coded in Rust instead of the usual C++ and it is the first web browser to truly utilize the power of a multi-core processor.
Because of these changes, Mozilla claims that Firefox is two times faster and takes 30% less power than its previous release.
It’s not just Mozilla who is claiming things on its own. There has been lots of