rem: statusText = document.getElementById("statusText"); if (statusText) statusText.setAttribute("label", aMessage); 
add:   try { statusText = document.getElementById("statusText"); if (statusText) statusText.setAttribute("label", aMessage); } catch (ex) {}; 
context:     onStatusChange: function(aWebProgress, aRequest, aStatus, aMessage)    {      statusText = document.getElementById("statusText");      if (statusText)        statusText.setAttribute("label", aMessage);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/404f22fd90a4b657fb3c2d3e43abf7322618f43c/MsgComposeCommands.js/clean/mailnews/compose/resources/content/MsgComposeCommands.js