I figured out how to install Steam on Debian 8 (jessie). Not a big deal; lot’s of people have figured it out. In fact steam is available as a non-free Debian package.
However, I prefer to install Steam manually and run it inside Firejail. This article is a reminder to myself, in case I forget how I did it.
Hopefully this information will also be useful to someone else. But I guarantee nothing. This procedure works for me, on my computer, with the few games that I tested. It may or may not work for you. more