Message Composition

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SAGE

This extension checks before sending an email that the type of the attached files is allowed and that the total size of the attached files respects a maximum limit. SAGE is the acronym for Safe Attachment Guard Extension.

Not yet rated
2 users
Added May 30, 2025

Paste Files as Attachments

This Thunderbird add-on fills the gap left by the modernized Attach-From-Clipboard add-on, which is no longer able to paste files from the clipboard as attachments after migrating away from legacy Mozilla code.

Rated 5 out of 5 stars (3)
16 users
Added May 29, 2025

TidySubject

Declutter Re:, Fwd:, and EXT tags automatically.

Rated 3 out of 5 stars (2)
5 users
Added May 22, 2025

FlexConfirmMail

Confirm mail address and attachments based on flexible rules.

This edition will have incompatible changes. Another edition for enterprise users with less changes:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail-stable/

Not yet rated
222 users
Added May 1, 2025

Search Selector

Плагин для выбора поисковой системы при поиске выделенного текста.

Not yet rated
1 user
Added April 30, 2025

Auto Capitalize Mail

Capitalizza automaticamente il testo nelle email.

Not yet rated
2 users
Added April 29, 2025

Quicktext Community Scripts

A set of Quicktext scripts maintained by the community

Rated 3 out of 5 stars (1)
176 users
Added April 25, 2025

Inbox Actions

Inbox Actions add convenient interactions to messages allowing users to interact with an product or service all without the user even having to open their email.

Not yet rated
6 users
Added April 13, 2025

Thunderbird-CloudLink

Inserting file link to mail with optional password and expiration date

Not yet rated
18 users
Added April 7, 2025

Webbuttons - Google Messages Web

Adds a button in the toolbar for Google Messages Web. Icon source: https://www.flaticon.com/free-icon/comment_9449200

Not yet rated
15 users
Added March 23, 2025

OpenAI Proofreader

This extension uses OpenAI gpt-4o-mini to proofread emails when the user clicks the extension icon.

Usage requires an OpenAI API key. OpenAI does not offer a free usage tier. Proofreading a 4-5 paragraph email costs a fraction of a cent.

Not yet rated
30 users
Added March 2, 2025

Gemini Proofreader

This extension uses Gemini Flash 2.0 to proofread emails when the user clicks the extension icon.

Usage requires a Gemini API key. There is a free usage tier that should be more than adequate for almost every user.

Not yet rated
19 users
Added March 2, 2025

Reply with Attachments

Automatically include attachments in email replies.
Skips SMIME certificates to avoid unnecessary attachments

Fügt automatisch Anhänge aus der ursprünglichen E-Mail hinzu.
Überspringt SMIME-Zertifikate, um unnötige Anhänge zu vermeiden.

Rated 4 out of 5 stars (3)
69 users
Added Jan. 17, 2025

ThunderAI Sparks

ThunderAI Sparks is an add-on designed to add advanced features to ThunderAI.

Not yet rated
279 users
Added Jan. 13, 2025

addy.io / AnonAddy for Thunderbird

Adds a button to the message composition window which updates recipient addresses to route the outbound message through addy.io or a self-hosted AnonAddy server, so your real, private email address isn't exposed to recipients.

Not yet rated
26 users
Added Jan. 9, 2025

Daily Reports

This plugin lets you store different profiles with CC, To, Subject and Signature values. Perfect if you need to send emails with similar details often.

Not yet rated
4 users
Added Dec. 4, 2024

AutoRemove

Remove specific mail addresses from To:, Cc: and Bcc:

Not yet rated
11 users
Added Nov. 18, 2024

AutoZoom

AddOn to save a text zoom for eMail text editor.

Rated 4 out of 5 stars (4)
157 users
Added Nov. 6, 2024

Webbuttons - Skype Web

Adds a button in the toolbar for Skype Web. Icon source: https://www.flaticon.com/free-icon/skype_16167326

Not yet rated
14 users
Added Oct. 11, 2024

AutoReplace

This AddOn offers a function of autocorrection / auto text replacement. You can save a shortcut and a replacement and it will replaced automaticly if you type your new eMail text.

Not yet rated
96 users
Added Sept. 25, 2024