add: gCSSPrefListener.shutdown(); 
context: function EditorShutdown(){  RemoveToolbarPrefListener();  try {    var commandManager = GetCurrentCommandManager();    commandManager.removeCommandObserver(gEditorDocumentObserver, "obs_documentCreated");    commandManager.removeCommandObserver(gEditorDocumentObserver, "obs_documentWillBeDestroyed");    commandManager.removeCommandObserver(gEditorDocumentObserver, "obs_documentLocationChanged");  } catch (e) { dump (e); }   }
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/643acf57f11ef390c75a6dbb1dd25746489003eb/editor.js/clean/editor/ui/composer/content/editor.js