I get the error msg 'services.addons.mozilla.org:443 uses an untrusted security certificate. The security certificate is untrusted because the issuer certificate is untrusted. (Error code: sec_error_untrusted_issuer) This could be a problem with the servers configuration or it could be someone trying to impersonate the server. If you have connected to this site successfully in the past it may be a temporary problem and you can try again later.