Browse - Computer Tips - Firefox gives me this error: "Your certificate contains the same serial number as another certificate

Date: 2008feb1
Product: Firefox

Q.  Firefox gives me this error: "Your certificate contains the same serial number as another certificate
issued by the certificate authotity. Please get a new certificate containing a
unique serial number."
for a site I setup with self-signed certificates.  How can I fix this?

A.  Delete the certificate and re-accept it.

Tools > Options > Advanced > Encryption > View Certificates