Google+ Notifications is a google chrome extension to view google+ notification.when someone adds you to a circle or shares a post with you the extension button will turn red and show you how many updates are waiting for you. Once you click the button, a window will drop down showing you all of your most recent notifications. You can act on notifications right from the extension, whether you’re replying to a comment or adding someone back to your circles.
Download Google+ Notifications
Google+ Notifications for Chrome