As you know, only some of the Linux distros out there even use .deb packages, never mind any dependency issues.

Firefox packages are generally provided by the users Linux distribution. There were talks in past where Mozilla was going to provide a place for users to easily find builds made by their distro or more generic package builds but that has not happened.

The tarbal version from is rather easy and quick to install as it is basically extract and run Firefox (even without using CLi). The hurdles you may have depends on if you want to make launchers/shortcuts to firefox script on panel, menu or desktop for example or to make sure the folder has read/write permissions for software update as a easy way around permissions is to put program folder in a folder in /home.

I know Mozilla experimented with RPM builds back in 2011 mainly for Nightly?Aurora builds then (never for a release) and they have stated Autopackage might be a option in past.

Surely the fact that some of the more popular Linux distro's(Debian, Ubuntu and it's varitions,Linux mint) can and do work with .deb should count for something. Yes, I can (and do) wait for the Upgrade Manager to say a Firefox upgrade is available. It is not my fault that Linux allows 4 ways of installing. This lack of a way of installing certainly can and does impede true cross platform compatibility, just sayin.

Thanks for the response, even if it doesn't help.