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Mark Read on Reply

Mark messages as read when you replied to them.

Rated 5 out of 5 stars (2)
135 users

Toggle Address Box

Adds a Address Box button, toggles the Address Box in the Composer window

Not yet rated
71 users

Simple Template

You will be able to create and automatically insert templates for each account.

Rated 4 out of 5 stars (1)
273 users

Copy Address

Copy email address to clipboard.

Rated 4 out of 5 stars (12)
1,615 users

Expand mailing lists

Adds an 'expand lists' button to the compose window. It replaces all mailing lists with their contacts.

Rated 5 out of 5 stars (2)
697 users

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (21)
49,180 users

Advanced Composer

Creates quote header in Ms Outlook style, message templates, signatures, message recipient groups, and more.

Rated 4 out of 5 stars (8)
418 users

acus

Update 2023: This addon will be replaced by "arcus".

Modern encryption in Thunderbird

** Currently in testing phase **
What you can do:
1. Set your secret key and automatically decrypt emails
2. Generate a new key pair
3. Encrypt plain text

Not yet rated
4 users

composeSelectMacro

定型文4つ保存しておいて、メールを作成する時にそのテキスト文を挿入できるツールです
You can prepare four fixed phrases, select them when composing an email, and insert them in the body of the email.

Not yet rated
28 users

Mail Merge P

Mail Merge P (Mail Merge with Preview) is a Thunderbird add-on to send bulk emails based on data provided in a spreadsheet. It uses the nunjucks templating engine.

Rated 3 out of 5 stars (16)
2,149 users

BestReply

BestReply is an add-on that aims to improve users’ experience by providing quick services to the user such as summarization of emails, response generations, as well as a smart chat with our AI model based on the email they are reading.

Rated 3 out of 5 stars (1)
6 users

Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the support page on how to use and why it sometimes does not work!

Rated 4 out of 5 stars (33)
8,048 users

reply-all-auto-cc

When reply to all is used, move original To: recipients to Cc:
Also forces "Cc:" to be displayed on all new messages.

GitHub Repo: https://github.com/cyb3rmonk/reply-all-auto-cc

Rated 5 out of 5 stars (4)
699 users

Estimez votre CO₂

Estimez votre CO₂ quand vous rédigez un courriel en un simple clic ! Pendant sa rédaction, cliquez sur l'extension afin de connaître l'émission de CO₂e générée par l'ensemble du cycle de vie. Vous aurez aussi accès à différentes équivalences utiles.

Not yet rated
42 users

Replaceholder

Replace placeholders with date and time as you type.
入力画面の件名、本文内の各プレースホルダを日時や曜日等の文字列に置換します。

Rated 2 out of 5 stars (1)
11 users

@Contact Mention

This add-on mimics the mentions behavior on Outlook when mentioning a contact with the '@' sign. The contact selected is added as a link in the email body as well as to the recipent list of the email.

Rated 4 out of 5 stars (9)
823 users

Grammar, Proofreading & Spell Checker

Check the grammar and spelling directly inside Thunderbird using Wordeep technology

Rated 4 out of 5 stars (4)
648 users

Jitsi Meet event generator

Event and link generator for Jitsi Meet service.

Rated 2 out of 5 stars (2)
265 users

Paste code

Thunderbird addon creating a context menu option that pastes code beautifully in HTML messages

Not yet rated
100 users

CustomCSS

Allow the user to configure custom CSS that will be added to messages when edited
(new, reply and forward). The custom CSS will be added to a newly created <style>
element in the email's head.

Rated 5 out of 5 stars (4)
167 users