Finding improper JavaScript globals.

globals.snippets.js

// globals.js
// https://gist.github.com/pocotan001/6305714
// Finding improper JavaScript globals

(function() {
    var prop, cleanWindow,
        globals = new function globals() {},
        body = document.body,
        iframe = document.createElement('iframe'),
        ignore = {
            console: true,
            Components: true,
            XPCNativeWrapper: true,
            XPCSafeJSObjectWrapper: true,
            getInterface: true,
            GetWeakReference: true
        };

    globals.__proto__ = null;
    iframe.src = 'about:blank';
    body.appendChild(iframe);
    cleanWindow = iframe.contentWindow;

    for (prop in window) {
        if (!(prop in cleanWindow) && !ignore[prop] && !/^\d/.test(prop)) {
            globals[prop] = window[prop];
        }
    }

    console.group('Found %c' + Object.keys(globals).length + '%c JavaScript globals.', 'color: red', '');
    console.dir(globals);
    console.groupEnd();

    body.removeChild(iframe);
})();