Web browser JavaScript snippet that allows you to list all user defined globals.
Released under the MIT license.
Dump this into your JS console while on the website of interest:
(function() {
var i = document.createElement('iframe'); i.style.display = 'none'; document.body.appendChild(i);
var b = Object.getOwnPropertyNames(i.contentWindow); b.push('getUserDefinedGlobals');
document.body.removeChild(i);
console.info(Object.getOwnPropertyNames(window).filter(function(x) { return b.indexOf(x) === -1; }));
})();