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: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/40322c3a88a5ada6eb02bc98b8772b82c9b892ac/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js