Surplus is an extension for Google Chrome that allows you to access Google+ notification, share, read and post comments, all from the browser’s interface without being on the Google+ website. The extension provides full browser integration, complete with desktop notification. You can even switch between several Google accounts.
The extension adds an icon to Chrome’s toolbar, near the address bar. Clicking on the icon opens a pop up window that displays all recent news and notifications, a share button and a link to the user’s Google+ profile. The share button opens Google+ sharing form, where you can enter text, links or upload pictures. You can also control visibility options – share the post with the public, with a circle or select people.
From the extension’s configuration box, it is possible to enable desktop notifications and sound notifications.
Surplus is very similar to the Facebook extension for Google Chrome.