How does a tar.bz2 file get installed?

I’ve downloaded WaterFox directly from Mozilla after not seeing it in the larger catalog of available APPS. It downloaded as a, tar.bz2, how is this installed?

cd ~/Downloads
tar -xvjf waterfox.tar.bz2   (extract, verbose, j compression, file)
cd waterfox
./waterfox

I’m new to this, all I need to know is do I enter each line, one at a time,

for example enter; cd ~/Downloads, then wait for an action,
then enter; tar -xvjf waterfox.tar.bz2, then wait for an action,
then enter; cd waterfox, then wait for an action,
then enter; ./waterfox

I assume that spacing when entering command is critical. and that this extracts as it goes so I don’t need to extract manually?

Yes, one line at a time …
the first line changes directory to Downloads
the second line extracts the contents of the bz2, you will see many lines
the third line changes directory to the newly created directory waterfox
the fourth line executes the waterfox binary

I’ve gotten it open and running, don’t see it listed in Menu.

Also, can go into folder that is on desktop and open Waterfox, I assumed that an Icon would be made and placed in the Menu under Internet?

I just gave you the commands to extract the bz2 file, I tried it on my
18.04, I did not see a launcher created. If you are running waterfox from a
terminal, you need to exit waterfox first and then close the terminal. I
looked online, there is an unofficial repository (ppa) where you can
install waterfox from. From what I understood, you are new to Linux so
adding repositories might be a bit advanced but here’s the url