The Gmail Notifier extension was an early adopter of notifications.As of
Chrome 5, we’re happy to announce that notifications are also available to extension developers.
When notifications are used from an extension, there are no permission prompts or infobar warnings. The experience is seamless - it just works.
To learn how to use the notifications API in your extension, review our
documentation. We’ll be on the lookout for some great examples of desktop notifications to feature on the
Chrome Extensions Gallery, so get cracking!
Posted by Aaron Boodman, Software Engineer 
