Sure, a certificate signed by one of the CAs that say Firefox trusts by default indicates *something*. Nothing that is useful for deciding if you trust software delivered from that host though.
A Verisign-signed certificate for "foobar.org" shows that Verisign is convinced that the person who they at one time sent the certificate too is the same entity that owns foobar.org.
This helps very nearly not at all.
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