I'm getting this error
>www.google.co.id
>uses an invalid security certificate. The certificate is not trusted because the
>issuer certificate is unknown. The server might not be sending the appropriate
>intermediate certificates. An additional root certificate may need to be
>imported.
>Error code: SEC_ERROR_UNKNOWN_ISSUER
this happend when using mozilla only, majority website undergo this error too, not all website tough.
I has been trying delete cert8.db, adjust date, configure proxy, refresh mozilla from troubleshoot, clear cache, even reinstalling mozilla