Description:
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Trying to delete a user note, for example:
https://master.php.net/note/delete/85479
FF 3.01 gives me the following message:
Secure Connection Failed
master.php.net uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
(Error code: sec_error_unknown_issuer)
 * This could be a problem with the server's configuration, or it could be someone trying to impersonate the server.
 * If you have connected to this server successfully in the past, the error may be temporary, and you can try again later.
    Or you can add an exception…

Reproduce code:
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Try https://master.php.net/

Expected result:
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valid security certificate (trusted issuer certificate) and normal page load

Actual result:
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page load error due issuer certificate is unknown