If you’ve ever used Gmail in latest Opera browser, you might have noticed unread count message on Gmail favicon in Gmail tab. You can now display undread count on Firefox tabs with Gmail Unread Message Count in Favicon script for Greasemonkey that shows the number of unread messages by changing the favicon in your Firefox tab/URL bar. 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.

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