Folders and Filters
Auto Filter Timer Requires Restart
Run existing message filters on any folder at a specified interval. Simply right-click the desired folder then choose from the [AUTOFILT] menu items. This is a hack/clean-up of another coder's work, but works perfectly. Use at your own risk
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
attachment column in search result list Requires Restart
Show the column for attachments in search results list. General search (edit-> search -> search emails) does not show by default if a message has attachments.
This addon adds this column, just as in a normal folder view.
Quick Folder Key Navigation Requires Restart
This extension makes it possible to quickly navigate to a particular folder in the folder pane simply by typing the first few letters of the folder name when the folder pane has focus.
Protected E-mail Addresses Requires Restart
Generates protected and disposable e-mail addresses and filters junk mail sent to invalid addresses.
EuropeanMX Spam Reporter Requires Restart
Train your EuropeanMX filter by reporting unrecognized spam or false-positives back to us.
Shedule Filters Requires Restart
Sheduled run message filters
Запуск фильтров сообщений по расписанию
This addon extends filtering to read messages downloaded during an IMAP synchronization (bug 308148)
Delete Only Empty Folder Requires Restart
Disallows to delete not-empty mail folders.
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.
Synchronize your favorite RSS sources with Thundebird and Feedly
Gravatars Requires Restart
Show a column with the Gravatar-picture and sender-name in email folders.
Toggle Folderpane View Requires Restart
This addon provides a toolbar button for toggling between the "All" and "Favorite" views in the folderpane.
QuickFilter Watched Threads Requires Restart
Adds a filter to show only watched threads
Novacoin Antispam Requires Restart
Keep a correspondence with only the well off people.
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Tidybird Requires Restart
Organize email into folders quickly and easily.
Resubmit Requires Restart
(Re)submit multiple messages to a predefined recipient(s)
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.
Adds personal filters to quickfilter toolbar
EmailPicky 4 Requires Restart
Grab email addresses from emails from any selected Email Folder and add them to your contacts. (Email Crawler / Email ID Grabber / Bounced email collector) - Thunderbird Plugin
Note: It doesn't create duplicates, but shows as 'xxx messages added'.