joshtalon
Mostly. No matter much you trim your certificate chain, there's nothing preventing Google/your bank/Amazon/etc from sharing their private key with, say, Uncle Sam. However, the backdoor admin access that the gov't gets to sites like TwitterFace and Gmail probably makes that a pointless effort.
Confidentiality/Authenticity are pretty much impossible to guarantee unless you control everything on both ends.
What I think sparked Mozilla is TrustWave's claim that this kind of thing is widespread and commonplace among CA's. That's shouldn't surprise anyone, though.
Of course, that doesn't stop a company from placing locally-trusted rogue certificates on computers they control, overriding Chromes public-key pinning check. But it means that they can't MITM a connection from your personal laptop when you're on their network.