Get Unread Gmail Message Count in Favicon


Update: Gmail now has a lab feature that does the same. Search for “Unread message icon.”

Shows the number of unread Gmail messages in the FavIcon in your Firefox tab.
Allows you to easily see how many unread messages you have without needing to switch back to Gmail. As the number of unread messages changes, the favicon in your Firefox tab or URL bar will change to show the number of unread messages you have in your inbox.

Features:

Download: Script