I haven't, and I'm not sure how to install them.
Actually this is probably a better way to install it in Zorin:
I've never done it myself, but the instruction seems quite clear.
The deb would be just as simple because he can double click to open the installer.
But I bit hesitated since it is from OpenSUSE.
The other method from git hub is more universal.
The only packages I've had an issue trying to convert and install are from Mac os. As far as i can tell, if it won't install that deb, which being in that package type should be installable on all devian based systems or systems that support deb, it can be converted in alien.
Okay, so I'm doing sudo ./get-waterfox-install
in Terminal (just like the ReadMe says), but it keeps telling me get-waterfox: command not found
Am I missing something?
Rui07: Tried the video - got a error: snap "waterfox-snap" not found message when implementing the first command ( sudo snap install waterfox-snap --edge)
337harvey & FrenchPress: I double-clicked and installed the files (didn't know I could do that until now - thanks!) - they appear to have successfully installed, but now I don't know what to do next.
Snap needed it means.
Open the list of applications and find Waterfox.
I made it work!
Turns out, for the deb files, I didn't install the "Waterfox Classic" one (already had two regulars I was trying to make work). Plugged them in, and Firefox Classic is now up and running!
Thank you all, and extra thanks to FrenchPress for the links.
As a side note, Waterfox "proper" still isn't running, but I suspect Classic will handle all my needs for now. As such, I'm deleting the regular program, and keeping Classic.
Not sure on this. The original Developer sold Waterfox to a corporate company not long ago. I was under the impression the project is not really being maintained anymore...
Actually my preferred Firefox alternative is Palemoon.
Unfortunately, no matter what I do, our main bank website would not let us use it, so we came back to Firefox.
It still is - their blog was updated as recently as the end of October.
Also, good news, everyone! I've now successfully found a way to make the current(ish) version work for Ubuntu 20.04!
First, run the following:
echo 'deb http://download.opensuse.org/repositories/home:/hawkeye116477:/waterfox/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/home:hawkeye116477:waterfox.list curl
-fsSL https://download.opensuse.org/repositories/home:hawkeye116477:waterfox/xUbuntu_20.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_hawkeye116477_waterfox.gpg > /dev/null
sudo apt update
sudo apt install waterfox-g3-kpe
Then, run the following:
echo 'deb http://download.opensuse.org/repositories/home:/hawkeye116477:/waterfox/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/home:hawkeye116477:waterfox.list curl
-fsSL https://download.opensuse.org/repositories/home:hawkeye116477:waterfox/xUbuntu_20.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_hawkeye116477_waterfox.gpg > /dev/null
sudo apt update
sudo apt install waterfox-current-kpe
You should have a working copy of G3 once done.
I changed a
from my posting to your posting 
Can we do both? Yours gave me the initial working solution, and it should still be considered valid for installing Classic.
If you want to do another response post combining both, that should definitely be the solution.
We don't get paid for solutions.
But the point of the solution is that it is directly linked in the O.P. leading any future readers right to the post that contains the actual solution, saving them time and searching.