@mcepl, I think it's obvious that Mozilla values popularity above software freedom. Maybe you're right that it's not what they value most of all. I really don't understand their values, to be straight about it, since they I simply can't reconcile what they say in their Form 1023 with this action.
Think of the real message they could make by using their wide install base to automatically present every user who goes to view a DRM'd file the real story about DRM?
That might change the world. Being a tool of the MPAA surely won't.