add: sizeColumn.setAttribute("tooltiptext", gMessengerBundle.getString("sizeColumnTooltip")); 
context: function SetNewsFolderColumns(isNewsFolder){  var sizeColumn = document.getElementById("sizeCol");  if (isNewsFolder) {     sizeColumn.setAttribute("label",gMessengerBundle.getString("linesColumnHeader"));  }  else {     sizeColumn.setAttribute("label", gMessengerBundle.getString("sizeColumnHeader"));  }}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/b970f7ac4f4a5e027ceebdf3a44172af08ae02a7/commandglue.js/buggy/mailnews/base/resources/content/commandglue.js