rem: return callFunction.call(this._sandBox, this._findProxyForURL, testURI, testHost); 
add: var rval = this._sandBox.FindProxyForURL(testURI, testHost); return rval; 
context:     getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return callFunction.call(this._sandBox, this._findProxyForURL,                                 testURI, testHost);    }
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/a2464376e0e62ebd4f63325d76f8f58e9ec10137/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js