See what's going on in your tabs, with just a glance:

Tab Badge recognises numbers in page titles, like the (1) in the Gmail picture above, and produces a round badge in your tab, so you can quickly scan which tabs want your attention. It also has special-case handling of Gmail and Google Plus.

Things you can change

If you've got Firefox 7 or above, you can change Tab Badge options within the Add-ons Manager. Otherwise, you can go to about:config and change these settings:

• extensions.tabbadge.backcolor/forecolor - change the colour of the badge and the text in the badge. You can specify any valid CSS colour.
• extensions.tabbadge.blacklist/whitelist - a space-separated list of domain names for controlling which sites the badge is shown for.
• extensions.tabbadge.mode - set to 1 for blacklist, 2 for whitelist.
• extensions.tabbadge.style - set to 1 for the standard circle badge, or 2 for the smaller, in-icon badge (see the Facebook image above).