Notification Counts in Page Title

I am having the notification modules in all pages. When there is a new notification, how can I show the notification counts in the meta title of all pages so it shows the browser tabs? (Similar to what stackoverflow does). Is there a php code I can add directly to the template's index.php to show the count if new notification exists? What's the easy way to do this?

Right now it shows in the ES pages but it goes away when I go to other pages.