Show Message Counts, Chat Alerts In Your Gmail Favicon
I’ll let the script author explain the icons himself:
- A Blue icon lets you know you have unread mail. New to 2.6, the number of unread messages is indicated in the icon!
- A Red icon means you’ve read all your mail (or, at least, clicked on them all).
- A Flashing Orange icon means someone has sent you a chat message.
Gmail FavIcon Alerts is a free download, requires Firefox and the Greasemonkey extension.