rem: if (!this._findProxyForURL) 
add: if (!("FindProxyForURL" in this._sandBox)) 
context:     getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return callFunction.call(this._sandBox, this._findProxyForURL,                                 testURI, testHost);    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/1cee9748b43a13fb69361ea14dcd0d027857cf0c/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js