rem: return this._sandBox.FindProxyForURL(testURI, testHost); 
add: return callFunction.call(this._sandBox, this._findProxyForURL, testURI, testHost); 
context:     getProxyForURI: function(testURI, testHost) {        if (!("FindProxyForURL" in this._sandBox))            return null;        // Call the original function        return this._sandBox.FindProxyForURL(testURI, testHost);    }
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/f4030a0ebc837617efbc9a1f238f0c8a754cc9b2/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js