sindresorhus/GitHub-Notifier — pull request #17 by jamime (2013-09-16 22:33:05+00:00)
Title: Made the disconnected indicator more descriptive and added infinity count for large values.

I feel that 'Not Available' better describes not being able to access the notification data compared to a sad face. Also added an infinity symbol for notifications that exceed 4 digits
http://developer.chrome.com/extensions/browserAction.html#method-setBadgeText