Message Composition

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Address Widget Lines

Address Widget Lines provides the ability to select the number of address lines to display in the message compose window.

Rated 5 out of 5 stars (18)
636 users

Attachemnt Encoding Detector

To detect file encoding of attachments, this forces to Thunderbird to use an encoding detector for a specific locale instead of the generic one.

Not yet rated
327 users

Automatic Dictionary No Restart

Extension that remembers the language of the spellchecker used when composing and switches to it every time you write to that person.

Rated 5 out of 5 stars (18)
2,415 users

AVIM

An input method editor (IME) for Vietnamese. Type Vietnamese diacritics directly into any Web page, Web app, or dialog box.
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Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, và hộp thoại.

Rated 5 out of 5 stars (30)
2,575 users

BorderColors GT

How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.

Rated 4 out of 5 stars (7)
3,612 users

CategoryManager

Category manager for CardDav contacts, also allows to send an email to all members of a category.

Rated 5 out of 5 stars (6)
841 users

Check and Send

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (24)
23,706 users

Clippings

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (162)
30,971 users

CodeHighlight

highlight code in email.

Rated 3 out of 5 stars (1)
45 users

Color Text Compose Buttons

Adds Text Color Buttons in Compose Toolbar and More: Pixel FontSize, Strikethough, Sub & Superscript, Lower & UpperCase. Also provide Tools: Insert iframe, Launch MathType, Maths & Greek Symbols, Load Template Variables and Duplicate Compose Window.

Rated 5 out of 5 stars (15)
1,691 users

Consigna para Filelink

Plugin para subir ficheros a Consigna (Junta de Andalucía) de forma automática desde Thunderbird.
Está ideado para el intercambio de ficheros de gran tamaño. Es un espacio de almacenamiento temporal y con algunas restricciones de acceso opcionales.

Rated 5 out of 5 stars (1)
389 users

CryptoData

Easily and quickly to encrypt / decrypt
For users: private messages via e-mail, blogs, social networks, forums, etc.
For webmasters: websites, images, photos, etc.
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (4)
1,092 users

DL for Thunderbird

Allows to convert large attachments to links automatically without 3rd party providers.

Rated 5 out of 5 stars (3)
1,280 users

Don't Send Linked Files

Prevents sending of linked files if they are file: URLs.

Rated 1 out of 5 stars (1)
20 users

Email signature for Thunderbird - WiseStamp

Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more

Not yet rated
2,888 users

Emoji Menu

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 4 out of 5 stars (1)
763 users

EnForward

Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).

This function can be invoked by "Forward to Evernote" in the context menu.

Rated 5 out of 5 stars (5)
2,026 users

Ethical signature

Add a button to the email composition toolbar, which lets you insert an ethical signature.

Not yet rated
38 users

Extra Format Buttons

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

Rated 5 out of 5 stars (4)
2,350 users

FastCC

A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!

Rated 5 out of 5 stars (1)
129 users