Watching when the Golden Cookie is about to appear and alerts you! This will only work properly in Chrome, make sure to click on the version number to grant permission for HTML5 notifications otherwise it will only notify in the JS console.

cookie_watcher.js

var watch = {
	handle: null,
	notified: false,
	stop: function() {
		console.log("Stopping");
		clearTimeout(watch.handle);
		watch.handle = null;
	},
	start: function() {
		console.log("Starting: Click the version number!");
		document.getElementById("versionNumber").addEventListener('click',
			function() {
				if (window.webkitNotifications.checkPermission() != 0) {
					window.webkitNotifications.requestPermission();
				}
			}
		);
		watch.handle = setInterval(watch.run, 1000);			
	},
	run: function() {		
		if (Game.goldenCookie.delay < 500) {
			if (watch.notified === true) {
				return;
			}
			console.log("Golden cookie (" + watch.notified + "): " + new Date());
			if (window.webkitNotifications.checkPermission() == 0) {
				var n = window.webkitNotifications.createNotification('img/perfectCookie.png', 'Golden Cookie', 'A golden cookie is about to appear!');
				n.show();
			}
			watch.notified = true;
		} else {
			watch.notified = false;
		}
	}
};