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: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/b0f92d8d56746ec5a4fdf623cc332521f7da2878/test_nsINavHistoryViewer.js/clean/toolkit/components/places/tests/unit/test_nsINavHistoryViewer.js