rem: var selectedFolder = gActionTargetElement.getAttribute("uri"); if (!selectedFolder) return null; 
add: var selectedFolder = gActionTargetElement.getAttribute("uri"); if (!selectedFolder) return null; 
context: function GetFirstSelectedMsgFolder(){    var selectedFolder = gActionTargetElement.getAttribute("uri");    if (!selectedFolder)      return null;    var msgFolder = GetMsgFolderFromUri(selectedFolder, true);    return msgFolder;}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/16e29cc346b3511d09593fe0badce6d008ad5899/FilterEditor.js/clean/mailnews/base/search/resources/content/FilterEditor.js