add: this._flavourSet.appendFlavour("application/x-moz-file", "nsIFile"); 
context:   getSupportedFlavours: function ()  {    if (!this._flavourSet) {      this._flavourSet = new FlavourSet();      this._flavourSet.appendFlavour("text/x-moz-url");    }    return this._flavourSet;  }
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/e249f3234396e5c985d3150c9c831f9e7d60559c/extensions.js/buggy/toolkit/mozapps/extensions/content/extensions.js