To install the Google Mail Checker add-on, you need to navigate in the host application to the appropriate Chrome Store entry and press the “Add to Chrome” button that you can find on the page. Chrome extension that streamlines the access to your Gmail account The add-on also provides quick access to the Gmail web app.
Google Mail Checker is a small Chrome add-on that integrates with the browser and offers you the possibility to see if there are any unread messages in your Gmail Inbox.