add: document.getElementById("smtp.alwaysSmtpSSL").setAttribute("disabled", "true"); 
context: function disableIfLocked( prefstrArray ){  for (var i=0; i<prefstrArray.length; i++) {    var id = prefstrArray[i].id;    var element = document.getElementById(id);    if (gSmtpPrefBranch.prefIsLocked(prefstrArray[i].prefstring)) {      if (id == "smtp.trySSL")      {        document.getElementById("smtp.neverSecure").setAttribute("disabled", "true");        document.getElementById("smtp.sometimesSecure").setAttribute("disabled", "true");        document.getElementById("smtp.alwaysSecure").setAttribute("disabled", "true");      }      else        element.setAttribute("disabled", "true");    }  }}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0137448eca1ab1efa60a8966d8af4a3d2333cbba/smtpEditOverlay.js/clean/mailnews/base/prefs/resources/content/smtpEditOverlay.js