@Douglas Perkins Mozilla claims their implementation (with a free-software sandbox) is different than the others (being the rest proprietary software), and puts the example of providing a 'site' fingerprint to the CDM without revealing user information (it seems the rest create the fingerprint based on device + user information). I wonder if corporations would accept that, or just say, at any time that they want, "no, it should work the same as in Chrome/Safari/IE..."