add:   if (this._downloadStatus.textContent == status) return; 
context:   _setStatus: function(status) {    while (this._downloadStatus.hasChildNodes())      this._downloadStatus.removeChild(this._downloadStatus.firstChild);    this._downloadStatus.appendChild(document.createTextNode(status));  },
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/fdfebd1585e4ec65b7280f9193d32ef8102b53c2/updates.js/clean/toolkit/mozapps/update/content/updates.js