rem: return callFunction(this, "_findProxyForURL", this._sandBox, 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 callFunction(this, "_findProxyForURL", this._sandBox,                            testURI, testHost);    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/df756cd425f14fa70657d2b758ead5ee4d8ab5d3/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js