Message Composition

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Extra Format Buttons

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

Not yet rated
27 users
Added February 26, 2015

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 (2)
904 users
Added January 2, 2015

Email signature for Thunderbird - WiseStamp

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

Rated 1 out of 5 stars (1)
1,873 users
Added October 5, 2014

Single Domain

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (1)
4 users
Added September 26, 2014

Resubmit

Re-submit messages received from users to a predefined recipient(s)

Not yet rated
11 users
Added September 26, 2014

Emoji Menu

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

Rated 4 out of 5 stars (1)
445 users
Added September 14, 2014

Synnefo for Filelink

Add Synnefo support to Thunderbird's Filelink feature.

Not yet rated
2 users
Added September 10, 2014

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)
211 users
Added July 16, 2014

tuneMDNDSN

fix behavior of notifications checkboxes in compose window when editing msg as new

Not yet rated
16 users
Added June 26, 2014

Filemail Attachments

With Filemail Thunderbird Add-on you can send large files directly from Mozilla Thunderbird using Filemail. Dec 2014: The 100 first people can sign up for a free account here: http://bit.ly/1z2f94L

Rated 3 out of 5 stars (1)
195 users
Added June 16, 2014

CodeHighlight

highlight code in email.

Rated 3 out of 5 stars (1)
41 users
Added June 13, 2014

Reply to All as Cc

Send a reply for recipients as CC except the sender, when you do "Reply to All".

Rated 4 out of 5 stars (2)
142 users
Added June 8, 2014

HtmlHighlightr

Provides source code highlighting in editor's "Insert HTML" dialog.

Not yet rated
66 users
Added May 23, 2014

IMAP Draft Unread

This is a Thunderbird addon that lets you customize the behavior of the IMAP draft unread messages. No more new mail notifications for your drafts!!

Rated 3 out of 5 stars (1)
214 users
Added May 3, 2014

X-Unsent support

Adds support for the X-Unsent header.

Rated 5 out of 5 stars (1)
27 users
Added April 13, 2014

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 (12)
1,275 users
Added March 24, 2014

PennyPost

This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.

Rated 5 out of 5 stars (2)
22 users
Added February 19, 2014

Insert Link from Local File

Inserts links from local files via drag and drop on the composition window.

Rated 2 out of 5 stars (1)
135 users
Added February 18, 2014

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
216 users
Added February 18, 2014

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 1 out of 5 stars (1)
5,113 users
Added February 18, 2014