Dear Moz, sorry to barge in on this topic, which I presume is an existing 
unpopular topic.

I want to ask about Firefox security implementation, possibly HSTS? Firefox 
seems to implement strict-er security in comparison to Chrome.

Our IT department have been making changes to implement SSO including using a 
SAML identity provider with Google services.

>From the perspective of our ICT support it looks like Firefox doesn't work. I 
>can no longer use Firefox with Google, or MDN or a range of other sites.

We've gone from Firefox as the recommended browser, to Chrome being 
recommended, and today I've got a support request open because I can't use 
Firefox at all. There is a risk that Firefox will become unsupported in our 
organisation simply because Chrome implements looser security, but at least it 
"works".

This doesn't look like a simple problem to solve for our IT. I'm not sure of 
the details but we seem to be forwarding SSL certs from outside our network and 
then they look like they're issued by us. FF allows some sites a security 
exception. Others just can't.

Is there some known practice or update that is required to "fix" this?

MDN:

Secure Connection Failed
The connection to developer.mozilla.org was interrupted while the page was 
loading.
The page you are trying to view cannot be shown because the authenticity of the 
received data could not be verified.
Please contact the web site owners to inform them of this problem.
This Connection is Untrusted

Google:

You have asked Firefox to connect securely to mail.google.com, but we can't 
confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted 
identification to prove that you are going to the right place.
However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean 
that someone is trying to impersonate the site, and you shouldn't continue.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox 
only connect to it securely. As a result, it is not possible to add an 
exception for this certificate.
Get me out of here!
Technical Details
mail.google.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
The server might not be sending the appropriate intermediate certificates.
An additional root certificate may need to be imported.
(Error code: sec_error_unknown_issuer)
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