Updates the favicon displayed in the browser (usually in the tab) to display a 'bubble' notification (number). Can be used (for instance) to draw the users attention to messages/alerts received in a tab that is not currently active. Note that you have to set up a working favicon for the extension to work. Also note that the library currently degrades to title update for Internet Explorer 9 and Safari 5, while Chrome, Firefox and Opera is fully supported. The add-on is Apache 2 licensed, the tinycon.js library that's used has a MIT license.