That would require a Firefox build without NPAPI support. A user can't differentiate between Flash or Silverlight playing a DRM video and non-DRM video, so remo

That would require a Firefox build without NPAPI support. A user can't differentiate between Flash or Silverlight playing a DRM video and non-DRM video, so removing NPAPI support entirely would be the only sure method. Firefox users can disable Flash or Silverlight if they don't want sites using plugin DRM. Likewise, Firefox users can remove the Adobe CDM or uncheck the "Play DRM content" setting if they don't want sites using EME DRM. https://support.mozilla.org/en-US/kb/enable-drm https://support.mozilla.org/en-US/kb/enable-drm