add: msgWindow.rootDocShell.allowAuth = true; 
context: function InitMsgWindow(){  msgWindow.messagePaneController = new nsMessagePaneController();  msgWindow.statusFeedback = statusFeedback;  msgWindow.msgHeaderSink = messageHeaderSink;  msgWindow.SetDOMWindow(window);  mailSession.AddMsgWindow(msgWindow);  document.getElementById("messagepane").docShell.allowAuth = false;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/bd596ad3f5923e8a200a9e9e081a0218e3c18669/mailWindow.js/clean/mail/base/content/mailWindow.js