it locks out new browsers because acquiring CDMs can be a pain if you want to roll-your-own<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><p>ctrl+f for &quot;What does this mean for downstream users of the Firefox code base?&quot;<p>tl;dr you either need to run a mozilla-built sandbox with no modifications, or literally call up adobe and ask about being given a CDM for your own browser, which they might just scoff at