I wish I could allow DRM for a single container.
I don't use DRM for my daily use of Firefox but from time to time I have to use it. At this moment, I have to switch to another profile when I have to. And this is not the most user friendly thing. Allowing DRM for a single container would allow me to just open the current tab to this container, and that is a lot more user friendly.
As a second step, it would be possible: if the user hasn't allowed DRM globally and has allowed DRM for a single container, then, when a website request DRM access asking the user if they want to open the current tab into the DRM container