I'm having a same problem where firefox complains about the self-signed cert but then when you click on view certificate, it says it's fine. I have an old self-signed cert that was expired which didn't seem to bother firefox until recently. I even tried issues a new valid cert and chrome and IE can see the new cert (new expiration dates) but firefox still gives me the "this connection is untrusted message". Then when I try to view the cert to add an exception it says it fine. One thing I noticed was that view cert in FF still shows the old cert expiration dates, whereas in chrome and IE the new cert shows up.

I have tried deleting the certs out of the certificate manager and adding the FF exception again but it didn't work. I even used IE to install the self-signed root cert again. IE and chrome will now open as a trusted page but FF still has the "this connection is untrusted" -> view -> cert is valid message.

I'm going to try a few of the suggestions above hopefully something will reset FF's cert exception/cache or something.

Thanks

I overinstalled FF 7.0 and FF 6.0.2 but it didn't help. I said heck with it and created a new profile and copied my profile over from a working machine. It's working ok now. upgraded back to FF 7.0.1

I was able to fix this on one machine by clearing my recent history through the Options dialog. On a second occasion, I was able to rule out "Browsing & Download History" and "Form & Search History", so I can say at this point that the problem can be fixed by clearing one or more of Cookies, Cache, "Active Logons", or "Site Preferences".

Oh, in all cases, I selected "Everything" for the time period to clear.