Mozilla does not provide updates to third-party builds, only to the official builds of Firefox from Mozilla. The Firefox package you have is updated by Mint. https://www.mozilla.org/firefox/all/desktop-release/linux64/ The tarbals are simple as you just untar them and run the firefox-bin to run Firefox is the basics. You can create a shortcut launcher on desktop or panel. There is a Firefox icon you can use in Firefox folder. Just make sure that the Firefox folder has read/write permissions for the user to get internal Firefox updates from Mozilla as a easy way is to have Firefox folder in Home. https://blog.linuxmint.com/?p=4259 where they incorrectly stated Firefox cannot handle its own updates as I guess the author was not aware of the internal updates for the official Linux builds of Firefox from Mozilla.