add:  var showAllHeadersPref = pref.GetIntPref("mail.show_headers"); if (showAllHeadersPref == 2) gViewAllHeaders = true; else gViewAllHeaders = false;  
context:     onStartHeaders: function()    {      ClearCurrentHeaders();      gGeneratedViewAllHeaderInfo = false;      ClearAttachmentMenu();    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/7b9be6ae50dd1399af78f3d125f983c2e4040348/msgHdrViewOverlay.js/clean/mailnews/base/resources/content/msgHdrViewOverlay.js