TCP_DENIED/407 4251 CONNECT push.services.mozilla.com:443 - HIER_NONE/- text/html

Should be old FAQ and found nothing effective to solve. I setup firefox to use a http proxy which with digest authentication. To prevent pop-up dialog, the username and password were stored in firefox database. Each time firefox starts, it will shoot "CONNECT push.services.mozilla.com:443" This is okay but sadly this action will go through the proxy *without* any authentication information retrieved from stored password database. Thus, for example, squid will complain TCP_DENIED/407 4251 CONNECT push.services.mozilla.com:443 - HIER_NONE/- text/html Any good way to ask firefox not to forget the authentication? I know this may violate some policies or rules or concerns by development team