I meant it a bit further. Not just disabling the EME external module, but disabling all related code in Firefox itself on the build stage. While functionally it won't make much difference, it would have more of a symbolic nature of making a point. Plus such builds would guarantee that it can't even be enabled at all (without user's knowledge for example).

If there would be build switches to disable that, I'm sure Linux distros with similar to Debian policies will ship versions where it will be disabled altogether.