Can't add a certificate exception in Firefox 4.0, relevant buttons are disabled

I try to access a web site from a local network via HTTPS. The web server uses self-signed certificates, and Firefox presents a common "This connection is untrusted" window.
In version 3.x I simply clicked "Add Exception", and then "Confirm Security Exception". In Firefox 4.0, when I click "Add Exception", I see:
# "This site provides valid, verified verification. There's no need to add an exception".
# The "Permanently store this exception" checkbox and the "Confirm Security Exception" button are disabled.
I cannot access this protected site anymore. Any suggestions?

There seems to be a work around to add exception.
You have to manually go to Tools -> Options -> Advanced -> View Certificates -> Servers -> Add Exception
Then the "Add Certificate Exception" window comes up. Just enter the URL at location https:// and click "Get certificate". Then "Add Security Exception".
This will allow you to access the site thereafter.
I'm not sure though why "Add Exception" button under the "I understand the rsiks" page does not work. May be a bug.

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I meet some issues with the Firefox certificates management. Here is my context:
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This is not the GPO approach but an alternative: [https://support.mozilla.org/en-US/questions/984237]
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Can't add a certificate exception in Firefox 4.0, relevant buttons are disabled

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