Message and News Reading
Remove Duplicate Messages (Alternate) Requires Restart
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
FolderFlags Requires Restart
Allows users to edit the flags Thunderbird sets on folders.
ThunderUpdate Requires Restart
Have ThunderBrowse version 2.8.7 or earlier? Install 3.0 from here: https://addons.mozilla.org/en-US/thunderbird/addon/5373 YOU DO NOT NEED TO INSTALL THUNDERUPDATE. GO INSTALL THUNDERBROWSE INSTEAD.
MarkSubfolders New Requires Restart
Mark all read for Subfolders
It's the same like MarkSubfolders but it's compatible with Firefox 4 and later.
Quote Colors Requires Restart
Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.
Simple Search-For Extension Requires Restart
Adds a "Search for" item to Thunderbird's context menu, like in Firefox.
Web reader for wide screens and long documents. Read with pleasure in attractive layouts.
Equations Requires Restart
Insert inline LaTeX equations into e-mail messages.
Email Notification Randomizer Requires Restart
Extension to randomize the email notification sound. Each time an email is received, the configured email notification sound is updated from the set of wav files in the configured folder...
POW -- Plain Old Webserver Requires Restart
Turn the web on its head with the Plain Old Webserver (POW), which adds a server to your browser.
Enable the View | Message Body As | All Body Parts message display mode.
EditEmailSubject (Edit email Subject) Requires Restart
This module allows you to change/edit email subjects
Leet Key Requires Restart
Transforms typed or static text to L337, ROT13, BASE64, HEX, URL, BIN, DES, AES, Morse code, DVORAK keyboard layout and to lower/to upper case functionality, Leet Font...
Folder Account Requires Restart
Lets you associate user accounts and identities with specific folders. Great for multiple users who share TB, or for managing mailing lists.
ThreadVis Requires Restart
Displays a small graphic visualising the context (thread) of the currently selected email.
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
Show Address Only Requires Restart
Adds columns to display Sender/Recipients mailaddress only.
Display Mail User Agent Requires Restart
Displays icon for user agent of received mails.
Gather the senders ! Requires Restart
Select all the mails in a directory sent by the selected authors.
Manually sort folders Requires Restart
This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.