Here is a description of Firefox&#x27;s CDM sandbox:<p><a href="https:&#x2F;&#x2F;hacks.mozilla.org&#x2F;2014&#x2F;05&#x2F;reconciling-mozillas-mission-and-w3c-eme&#x2F;" rel="nofollow">https:&#x2F;&#x2F;hacks.mozilla.org&#x2F;2014&#x2F;05&#x2F;reconciling-mozillas-missi...</a>