With the introduction of OS X Mavericks (OSX 10.9), Apple has introduced a “push” notification feature that allows websites to push updates directly to your desktop when new content is posted.
In order to take advantage of this great new feature, visit the site in OSX Mavericks (10.9) and Safari 7. A popup window will display:
Whenever 9to5Google publishes a new story you’ll receive the notification directly on your desktop notification area.
In order to unsubscribe from notifications, you can simply use Safari’s preferences (Safari > Preferences > Notifications).