add: return false; if (aFolder.Value == "NC:BookmarksTopRoot") 
context:   isValidTargetContainer: function (aFolder, aSelection)  {    if (!aFolder)      return false;    if (aFolder.Value == "NC:BookmarksRoot")      return true;    // don't insert items in an invalid container    // 'file:' and 'find:' items have a 'Bookmark' type    var type = BookmarksUtils.resolveType(aFolder);    if (type != "Folder" && type != "PersonalToolbarFolder")      return false;    // bail if we just check the container    if (!aSelection)      return true;    // check that the selected folder is not the selected item nor its child    if (this.isContainerChildOrSelf(aFolder, aSelection))      return false;    return true;  },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/025a088dcc8007fa5d7d45b93b6e22219ed1e453/bookmarks.js/buggy/browser/components/bookmarks/content/bookmarks.js