Certificate exception for github.com not working with built-in root CAs removed

[email protected]
Newsgroups gmane.comp.mozilla.security
Message-ID <[email protected]> 
Hello everybody,

I'm seeing following issue on current releases of both, Firefox and 
Thunderbird: If one removes all built-in root CAs in the Certificate 
Manager and adds a server exception for github.com, no connection is 
possible (Error code: sec_error_unknown_issuer).

While other servers, e.g., www.joomla.org, www.auswaertiges-amt.de can 
be connected to without problems. What can be seen on 
https://www.ssllabs.com/ssltest/analyze.html?d=github.com is that it 
supports HSTS, while the two working above don't. Could there be an 
issue with that here?

Many more details on https://bugzilla.mozilla.org/show_bug.cgi?id=1202511

Best,

Joe
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