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Unread Tabs
Unread Tabs is a Firefox extension that marks unread tabs so you know (that you haven't read them)....
IO::Unread
Push more than one character back onto a filehandle...
Unread Gmail Favicon
Display the number of unread messages over a Gmail tab's favicon...
Docky Unread Count
Displays total unread messages in Docky...
Advanced Unread Folders
Adds a folder view showing unread folders, including their hierarchy...
TB Menubar Unread Notifier
A Thunderbird notification solution for unread messages...
gpum - Gmail Popup Unread Manager
Manage unread messages in your GMail from pretty pop-up...
Ubuntu Unity unread count and quicklist
Notify Unity of new mails in Thunderbird...
thunderbird extension notification thunderbird Unity new mails
Outlook Web App: Show Unread Count in Tab
A message notifier for the Outlook Web App...
Liquid Tabs
Adds opening and closing animations to the Firefox tab bar...
Sort tabs
Adds tab sort option to the tab context menu...
Tile Tabs
Allows tabs to be tiled within the Firefox browser...
All Tabs Helper
This add-on for Mozilla Firefox will enhance the default All Tabs drop-down menu...
Text::Tabs
Expand and unexpand tabs per the unix expand(1) and unexpand(1)...
Side Tabs
This restartless add-on for Firefox moves your tabs on the sidebar...
Indexify Tabs
This Firefox add-on will simply index all your tabs, in real-time...