nsISSLCertErrorDialog in Firefox 3.5

  Called when an SSL connection aborts because of a bad certificate,
  and no other code is in place for reporting the problem.
  Should bring up a dialog to inform the user and display the certificate.

  @param status Might be used to query additional information
  @param cert The certificate that this error is about
  @param textErrorMessage An error message with whitespace formatting
  @param htmlErrorMessage Optional, might either be empty,
                              or might contain the same message as in
                              textErrorMessage plus some html formatting.
  @param hostName The error occurred when connecting to this hostName.
  @param portNumber The error occurred when connecting to this portNumber.