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InsertSignature

Insert signature helps you to insert usually used text by your customization.

Rated 3 out of 5 stars (10)
1,275 users

HTML Source Editor

Allows to edit the source of the currently composed message. A simple alternative to ThunderHTMLedit.

Rated 5 out of 5 stars (12)
2,694 users

Arcus

Modern encryption in Thunderbird - powered by Rust, rage and WebAssembly

Rated 5 out of 5 stars (1)
16 users

Safe Links Cleaner

Clean up the display of links rewritten by Microsoft ATP Safe Links when reading and composing mail, so the original links can easily be viewed and copied, while retaining the rewritten addresses as the actual target of all links.

Rated 4 out of 5 stars (2)
111 users

Compose Responsive Images

When writing new emails, newly inserted images are made responsive by setting style="max-width:100%" and removing width/height attributes.

Rated 5 out of 5 stars (1)
149 users

To must occur only once

This add-on changes all but the first "to" to "cc" if there are multiple "to" when replying to an email.

Rated 5 out of 5 stars (1)
26 users

TuLPe

Traffic light protocol extension for Thunderbird, messages are customizable in the option page.

Not yet rated
16 users

CloneMessage

When composing an email, CloneMessage allows you to duplicate the current state of the email.

Rated 5 out of 5 stars (1)
129 users

stripImages

Remove all images from message with one click.
Places a "strip images" button on the toolbar of the message compose window.
Clicking the button will remove all images from the message.
This helps keep mailbox disk space down.

Rated 4 out of 5 stars (10)
200 users

New Email To All:reply, ready for new subject/body

Do you often send emails to the same list of people? Do you press reply and then clear off subject/email body?

No longer. Open a new compose window with all recipients/cc/bcc in a clean state. You can start with a new subject line and email body.

Rated 3 out of 5 stars (8)
304 users

PopMailListRecipients 2

Expands address book lists to recipients addresses in the compose window

Rated 4 out of 5 stars (5)
221 users

External Editor Revived

Edit emails in external editors such as Vim, Neovim, Emacs, etc.

Rated 5 out of 5 stars (7)
329 users

Netiquette Checker

An integrated netiquette checker for EPITA students.

List all the netiquette rules that are not respected when writing an email.

Feel free to contirbute to the repository:
- https://github.com/d4ilyrun/netiquette

Not yet rated
4 users

Proton Mail Toolbar Button

Adds a Proton Mail button to the toolbar. The button simply opens a new tab with the https://mail.proton.me webpage.

Rated 5 out of 5 stars (3)
445 users

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Rated 5 out of 5 stars (16)
40,109 users

Text Insert: Templates/Instant Spell Check

Email composer:

*Upper case the first letter of nouns, names, or words at sentence start
*Android(TM) like spellcheck/suggest alternatives (DE, EN, ES, FR,NL)
*Insert styled text, images, tables with shortcuts
*Define shortcut-replacements.

Rated 3 out of 5 stars (7)
248 users

Strip inline images

Adds a button to the compose window to remove inline images from messages. The images are replaced with their filename in angled brackets.

This is helpful when replying to long message threads with lots of embedded images.

Rated 5 out of 5 stars (2)
119 users

Textmarker

Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)

Rated 5 out of 5 stars (33)
35,328 users

telegramwebapp

Adds browser action icon to toolbar to open Telegram. See https://thunderbird-essentials.thomas-bandl.de/wordpress/2020/10/04/telegram-button/

Rated 3 out of 5 stars (2)
106 users

Reply with subaddress

Reply to a message that was sent to a subaddess with the same address.

Example: Your primary email is tim@mymail.tld, you receive a mail to the subaddress tim+mailinglists@mymail.tld, the sender of replies is set to tim+mailinglists@mymail.tld.

Rated 3 out of 5 stars (3)
62 users