Once again, learning a lot!
I don't use R3dFox to watch DRM comment, so I didn't even realize R3dfox had disabled DRM. As you say, shades of Pale Moon. All the niche browsers combined aren't going to force YouTube et al. to abandon it!
And I agree that the correct way to deal with the issue is to leave the DRM supporting code in the browser, and just disable it with a pref, which can then be re-enabled by the user if desired.
Finally, I do consider VMP evil, and understand that niche browsers like R3dFox will never support VMP. But as long as there are sites that impose DRM but don't require VMP, we should still be allowed to access those sites.
All that said, though, I still appreciate having R3dFox on my "ancient" Win 7 PC and will keep using it for the ever-increasing number of Web sites that flummox Serpent.