Up until today if you wanted to view your Google+ unread notifications you would needed to had used a a third-party extension similar to Surplus. However this week Google has now rolled out a a new update to its Google+ social network that has brought with it a new feature that now shows unread notifications directly in the Tab Bar of your browser.
The new Google+ update has added a small tab notification count which displays the number of notifications a Google+ user has. Which will update every time a user receives a new message or friend request. As long as you have a Google+ tab or window open in your browser.