It's still permitted in the policy. 

https://www.mozilla.org/en-US/about/governance/policies/security-group/certs
/policy/#inclusion

Section 8.

-----Original Message-----
From: dev-tech-crypto
[mailto:dev-tech-crypto-bounces+jeremy.rowley=digicert....@lists.mozilla.org
] On Behalf Of Martin Thomson
Sent: Wednesday, February 15, 2017 5:06 PM
To: mozilla's crypto code discussion list
<dev-tech-crypto@lists.mozilla.org>
Cc: mozilla-dev-tech-crypto <mozilla-dev-tech-cry...@lists.mozilla.org>
Subject: Re: xmlsec / ECDSA problem

On Thu, Feb 16, 2017 at 4:22 AM, Gervase Markham <g...@mozilla.org> wrote:
> Did things break when we disabled it?

A few things.  It lasted less than a day in Nightly before we got multiple
bug reports.

> Do we know why Chrome decided not to support it? Two NIST curves is
enough?

That's my understanding.  P-521 isn't busted, it's just a little inefficient
and not enough stronger than P-384 (or X448) that it is worth keeping around
when faced with a working quantum computer.  That and the fact that more
options is more code to carry, more options to signal, and so forth.  I
think that's the reasoning.
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