----- Original Message -----
> From: "Chris Palmer" <pal...@google.com>
> To: "Hubert Kario" <hka...@redhat.com>
> Cc: "David E. Ross" <nobody@nowhere.invalid>, 
> mozilla-dev-security-pol...@lists.mozilla.org
> Sent: Tuesday, 22 July, 2014 1:08:57 AM
> Subject: Re: Proposal: Switch generic icon to negative feedback for non-https 
> sites
> 
> On Sun, Jul 20, 2014 at 3:23 AM, Hubert Kario <hka...@redhat.com> wrote:
> 
> > and while we're at it, let's get rid of those warnings about self
> > signed certificates -- they are less insecure than HTTP (Firefox actually
> > uses certificate pinning for sites with previously waived cert problems!)
> > so let's not treat them worse than HTTP connections
> 
> I'm pretty sure Firefox merely remembers your decision to click
> through the warning, not that it pins the keys/certificates in the
> chain you clicked through on.
> 
> Although I have proposed that for certain use-cases, its applicability
> is limited — will people know how to recover if the key(s) change(s)?

No, I'm sure it remembers the certificate.

I have setup a SNI-enabled server that returns one certificate for two
different virtual hosts.

When the certificate was about to expire, I changed it to
a new one signed by a trusted CA, for the site for which the CN matched,
the Firefox didn't even bat an eye, for the site for which I had to waive
the mismatched CN in the past, I had to waive the certificate again.

I can retests with self signed certificates, but I'd be very surprised
if it didn't work exactly the same.
-- 
Regards,
Hubert Kario
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