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Tab Badge 2 No Restart
by Geoff Lankow
Adds a small badge to your tabs to alert you to (for example) new messages on Facebook. The badge is also visible when the tabs are pinned so you can see when there's something new available.
About this Add-on
* Display a popup message in the corner of your screen, which will bring the appropriate tab and window to the front when clicked on.
* Highlight the Firefox icon, which does different things depending on the operating system. On Windows, the Firefox icon on the task bar flashes orange. On OS X, the dock icon bounces.
* Play a sound.
These alerts are configurable from a totally new options page. To see the new page, visit about:tabbadge, or click on the options button in the Add-On Manager.