rem: return this._findProxyForURL(testURI, testHost); 
add: return this._findProxyForURL.call(this._sandBox, testURI, testHost); 
context:     getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return this._findProxyForURL(testURI, testHost);    }
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/40246f8fb1309f96d92d9865231dfc7972178e63/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js