add: this.movedItem = null; 
context:   reset: function() {    this.insertedItem = null;    this.removedItem = null;    this.changedItem = null;    this.replacedItem = null;    this.openedContainer = null;    this.closedContainer = null;    this.invalidatedContainer = null;    this.allInvalidated = null;    this.sortingMode = null;  }
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/d4b9957f58e0f3c6ecbfc5fcef87de775add1712/test_nsINavHistoryViewer.js/buggy/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js