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Use Bcc Instead Requires Restart

Sorry but this addon is no longer supported in TB 60. See below.
Who among us has not made the mistake of sending a 'broadcast' email to a large number of recipients without using BCC; thereby revealing everyone's email addresses to all?

Rated 5 out of 5 stars (31)
51 users

Unified Search Requires Restart

Unify the global search box and the quick filter box in a new widget (the 'Unified Search Widget') with all filter and search capabilities at once.

Rated 4 out of 5 stars (28)
14 users

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (27)
96 users

No need flash plugin on embeded youtube movies

No need flash plugin on embeded youtube movies

Rated 4 out of 5 stars (25)
41 users

Webreq® Mailboard® Requires Restart

Consente di esportare tutte le impostazioni IMAP ed SMTP della caselle email per accedervi dal web, dallo smarthone oppure reimportarle su altra postazione con Thunderbird.

Not yet rated
2 users

Vietnamese Dictionary

Enables spell checking in Vietnamese with a wordlist based on Hồ Ngọc Đức’s Free Vietnamese Dictionary Project.

Rated 5 out of 5 stars (26)
331 users

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

Rated 4 out of 5 stars (2)
13 users

Lightning Reminder Left Buttons Requires Restart

Tired to mistakenly press that "Dismiss All" button? Move the Lightining Reminder "Snooze all for" and "Dismiss All" buttons to the LEFT!
... and from version 2.0 you can keep them on the RIGHT, but swapped!

Rated 3 out of 5 stars (2)
9 users

Diccionario Ortográfico de Español Colombia

Este diccionario no constituye un diccionario de definiciones sino un diccionario destinado para la corrección ortográfica de Español Colombia (es-CO). Colombian spanish (es-CO) spellchecker.

Rated 5 out of 5 stars (4)
619 users

Slovar za slovenski jezik

Spell-checking dictionary for the Slovene language

Rated 5 out of 5 stars (16)
2,332 users

Thunderbird Biff Requires Restart

This add-on provides a visual indicator of new Thunderbird mail availability in supported clients (Firefox, Sunbird) and Thunderbird itself. Note: you MUST install this add-on in BOTH Thunderbird and supported clients as there are both client AND ser...

Rated 4 out of 5 stars (37)
5 users

Greek - English (US) Spelling dictionary

Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey

Rated 5 out of 5 stars (11)
588 users

Address Move Button Requires Restart

Allow you to add a Address Move Button to mail compose window.

Rated 5 out of 5 stars (3)
177 users

DOM Inspector Plus! [dm] Requires Restart

Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.

Rated 4 out of 5 stars (6)
31 users

ViewAbout Requires Restart

Enables access to various about: dialogs from the View menu.

Rated 4 out of 5 stars (18)
31 users

QFO - Quick Fuck Off Requires Restart

This extension serves the purpose of providing instant access to the FOAAS web service. FOAAS (Fuck Off As A Service) provides a modern, RESTful, scalable solution to the common problem of telling people to fuck off.

Rated 4 out of 5 stars (3)
4 users

AttachExtraTools Requires Restart

This extension gives more options and tools to attach files from compose window.

Rated 4 out of 5 stars (12)
39 users

Český slovník kontroly pravopisu (bez diakritiky)

Slovník pro kontrolu pravopisu u textů bez diakritiky pro aplikace Mozilla

Rated 4 out of 5 stars (8)
2,174 users

Thunderbird Taiga Integration Requires Restart

Convert mails to user stories, tasks and tickets for the Taiga project management system. See https://pehei.de/post/thunderbird-taiga-integration for instructions.

Not yet rated
0 users

Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 5 out of 5 stars (8)
62 users