Folders and Filters
Cleans your Firefox, Thunderbird, SeaMonkey, Fennec (unstable), Instantbird and BlueGriffon.
IMAP Draft Unread Requires Restart
This is a Thunderbird addon that lets you customize the behavior of the IMAP draft unread messages. No more new mail notifications for your drafts!!
SmartFilters Requires Restart
Tired of writing a lot of filters? Install SmartFilters now to organise your mailbox automatically. It can sort out your mailing lists and robot emails.
Adds personal filters to quickfilter toolbar
folderplus Requires Restart
This extension adds some basic missing features about folders.
Move mails to their conversation folder. Navigate to folder with new keyboard shortcuts.
Sieve Out of Office New Requires Restart
A Thunderbird plugin to allow one to set out of office messages and / or redirect emails to colleagues via a easy to use pop-up dialog.
This Out of Office plugin requires that your POP3 / IMAP server also have a sieve service.
CapsKiller Requires Restart
Caps Killer is a protection against newbies using caps in their mails.
Resubmit Requires Restart
(Re)submit multiple messages to a predefined recipient(s)
Folder Levels Requires Restart
Rank your email folders by how much you care about them, and hide the ones you don't need right now.
Tidybird Requires Restart
Organize email into folders quickly and easily.
SavedSearchThemAll Requires Restart
A Thunderbird extension to automagically extend all the saved searches to all the foders!
Collapsed Unread Requires Restart
Shows unread email count for collapsed folders even if the unread mails are in subfolders.
Novacoin Antispam Requires Restart
Keep a correspondence with only the well off people.
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QuickFilter Watched Threads Requires Restart
Adds a filter to show only watched threads
Toggle Folderpane View Requires Restart
This addon provides a toolbar button for toggling between the "All" and "Favorite" views in the folderpane.
Gravatars Requires Restart
Show a column with the Gravatar-picture and sender-name in email folders.
TotalQuickFilter Requires Restart
Reboot the QuickFilter bar.
Synchronize your favorite RSS sources with Thundebird and Feedly
Inbox Cleaner of expired Emails Requires Restart
Moves expired Emails out of your Inbox!