Vá para about:config . Adicione my-ssl-site a security.tls.insecure_fallback_hosts :
security.tls.insecure_fallback_hosts my-ssl-site
O Firefox dá:
Secure Connection Failed
An error occurred during a connection to my-ssl-site. SSL peer reports incorrect Message Authentication Code. Error code: SSL_ERROR_BAD_MAC_ALERT
- The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
- Please contact the website owners to inform them of this problem.
Mas não dá a opção de continuar de qualquer maneira.