If it were up to me, I would just want r3dFox to be stock Firefox ESR 140.x, with the ability to run it on Windows 7 and Windows 8. That's it. No Anti-DRM or Wildevine either, since I want to be able to watch streaming news channels. But I'll live with that.
Not really possible, read this, specifically the "Widevine or DRM protected content does not play" section.
https://github.com/Eclipse-Community/r3dfox/issues/35
A new solution:
A portable FF for all Linux Distributions or a portable FF for all existing OS's or a new Version of FF OS like the selfrunning DOSBox Pure Unleashed ! ^^
I think that's kinda just a generic Linux binary. They're pretty portable although Linux isn't made to run raw binaries like that.
Can you give us a tutorial , who you create r3dfox?
I don't think I can just give a tutorial on that, it's pretty complex. I'd just start by taking a given commit, looking at the title and comments around it, and seeing if you can figure out what code changes in the commit do what specifically.