Can't add a certificate exception in Firefox 4.0 - "add exception" button do nothing

I am opening web site with untrusted certificate. I would like to accept this certficate, so I click "Add exception" button. Unfortunately, confirmation dialog do not show up. In fact nothings happends. This problem is relevant to all websites with untrusted certificates.

Going through the preferences to add a certificate is a workaround and not intuitive to users. The Add Exceptions button used to bring up a popup in Firefox version 3.5.9 that allowed you to add an exception for the server:port in my case. Is there a way to get the Add Exception button to work in Firefox version 3.6.12, it currently does nothing which is totally confusing to the user.

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