Folders and Filters
Minimum and fast URL blocker.
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.
Purge Events Plus Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
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!
Count Filters Requires Restart
This add-on provides various search filters couting values, such as total number of recipients, or number of lines, words,links in body message.
QuickArchiver Requires Restart
Clean up your inbox! While moving a mail the first time, QuickArchiver remembers the destination folder and enables you to move further mails with a single click. You can apply rules by sender, recipient and subject.
Delete Only Empty Folder Requires Restart
Disallows to delete not-empty mail folders.
Automatically marks all messages in the [Gmail] folder and all subfolders as read.
This addon extends filtering to read messages downloaded during an IMAP synchronization (bug 308148)