rem: return callFunction(this._findProxyForURL, this._sandBox, testURI, testHost); 
add: return callFunction.call(this._sandBox, this._findProxyForURL, 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: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/5ab9bad4265d5e1aeb904d051532c1c22283bb94/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js