Check Google+ Notifications from Google Chrome
Another Google+ tip. Chrome extension, to be precise. You can now add a small notification checker extension in Google Chrome which displays your new notifications number and will take you to Google+.
Not just this. This extension now also supports desktop notifications and sound. Google+ Notification Checker is a very simple Chrome extension that displays the number of unread notifications in Google+.
Download Google+ Notification Checker
You can download this Chrome extension from here: Download Google+ Notification Checker