The specification is called EME.<p><i>&gt; Beginning in version 47, Firefox desktop also supports the Google Widevine CDM.</i><p><a href="https:&#x2F;&#x2F;support.mozilla.org&#x2F;en-US&#x2F;kb&#x2F;enable-drm" rel="nofollow">https:&#x2F;&#x2F;support.mozilla.org&#x2F;en-US&#x2F;kb&#x2F;enable-drm</a>