It looks like you are using a package build from Ubuntu. If there are no more Firefox updates in your package manager then your distro version may no longer be getting package updates? https://support.mozilla.org/en-US/kb/install-firefox-linux The official Firefox tarballs from Mozilla will get updates even if your distro is no longer updated. https://www.mozilla.org/firefox/all/#product-desktop-release There is no installer, make, build etc as you just extract and run the firefox-bin though the firefox script works also. You can then make a launcher shortcut to said file on desktop or panel or such. Make sure 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. Also this is not used to replace or update your package build of Firefox.

Just in case it's needed. https://www.youtube.com/results?search_query=update+firefox+in+ubuntu What version of ubuntu are you running?

You could try installing the [[Install Firefox on Linux#w_install-from-flatpak|flatpak package]].