Hi neznan,

Have you looked at the Secure connection failed and Firefox did not connect Knowledge Base article? Your certificates might not actually be lost. Something as simple as an incorrect system time can make it appear as if they've all been removed. I'd try the steps in that article first.

Hopefully this helps!

Do you still see the certificates in the Certificate Manager?

• Tools > Options > Advanced : Encryption: Certificates - View Certificates > Your Certificates

If not then you would need a backup copy of the cert8.db file in the Firefox Profile Folder.

• http://kb.mozillazine.org/Profile_folder_-_Firefox