Not a new Feature for Windows, to use an enterprise CA to create server certificates.
And Firefox added the possibility to trust those certificates ages ago – but still you’ll get an TLS-error-message (in German „Kein Verbindungsversuch unternommen: Mögliches Sicherheitsproblem“).
This is no Security-Problem, it’s just a problem of using stupid defaults causing people to waste their time and providing no little level of security, since a CA operated on my own is much more trustworthy than public CAs which firefox trusts blindly.
security.enterprise_roots.enabled := true
As part of my personal „move away from evernote“ initiative this has been documented here, maybe it’s interesting for somebody.