This tutorial will be showing you 2 ways you can use to install Firefox quantum on Debian 9 Stretch desktop.
Starting with Firefox 57, Mozilla branded its open-source web browser as Firefox quantum to distinguish it from previous versions of Firefox. The name derives from project quantum, which aims to build the next-generation web engine for Firefox users.
This tutorial is going to show you how to install Firefox quantum by using snap packages and by using the tar archive from Mozilla. Some folks suggests installing Firefox quantum from Debian unstable (sid) repository or from a Ubuntu testing PPA. I do not recommend these two methods because they may cause instability
Read full tutorial here: https://www.linuxbabe.com/debian/install-firefox-quantum-debian-9-stretch
