I have downloaded "waterfox-G4.0.6.en-US.linux-x86_64.tar.bz2" to my usual Downloads directory on a laptop that was running Ubuntu 18.04 LTS. That machine has been upgraded with Ubuntu 20.04 and then 22.04. So I still want to install the Waterfox G4.0.6 -- the package has not changed at all in the day or so it took me to make Ubuntu reasonably current.
I guess what puzzles me most is how a "package" can be just about anything according to some of the answers to similar questions (on this site) about installing Waterfox or other software all wrapped up as a .tar.bz2 file or something similar.
Practical solutions to installing "waterfox-G4.0.6.en-US.linux-x86_64.tar.bz2" on Ubuntu 22.04 would be very helpful.