Message Composition

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Freecosys - FileLink provider

Turns your huge files into short links

Not yet rated
196 users

Nextcloud for Filelink Requires Restart

"Nextcloud for Filelink" is an Open Source Thunderbird extension which makes it easy to send large attachments with Thunderbird by uploading them first to a Nextcloud server and by then inserting the link into the body of your email.

Rated 3 out of 5 stars (45)
173 users

EnhancedReplyHeaders

Customizable headers for Thunderbird

Rated 4 out of 5 stars (6)
169 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)
165 users

AddAccents

This extension allows you to easily insert accented characters as you type in firefox or thunderbird. It is similar to abctajpu (no longer supported). With the default settings, simply press "e" followed by "\" to insert "é" "a\" to insert "à" etc...

Rated 5 out of 5 stars (2)
162 users

ThunderAI

ThunderAI uses the capabilities of ChatGPT to enhance email management.
It enables users to analyze, write, correct, and optimize their emails.
There is no need for an API key and is possibile to use this extension even with a free account!

Rated 5 out of 5 stars (3)
160 users

Seafile Filelink

A FileLink provider

With it you can store attachments on a seafile share

Rated 4 out of 5 stars (3)
157 users

Extra Format Buttons Requires Restart

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

Rated 4 out of 5 stars (19)
150 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)
147 users

One-by-One Forward Requires Restart

Highlight multiple emails, right-click, then select "One-by-One Forward". This extension will allow you to forward the selected emails, one-by-one, to the recipients you specify using your choice of attachment handling.

Rated 3 out of 5 stars (9)
147 users

Mark Read on Reply

Mark messages as read when you replied to them.

Rated 5 out of 5 stars (2)
134 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)
130 users

CloneMessage

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

Rated 5 out of 5 stars (1)
128 users

Toggle Word Wrap Requires Restart

Toggle word wrapping and <PRE> element wrapping in the message composition and HTML display windows, respectively. Based on original version by Kaspar Brand.

Rated 5 out of 5 stars (6)
126 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)
120 users

DS-BCC

Data protection extension, to avoid data mishaps with circular mails:

1. warning for e-mail with multiple recipients not in BCC (exceptions possible)
2. warning for roundmails with a different recipient domain
3. warning if PGP key is present

Not yet rated
120 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)
119 users

Notebird

Prendi appunti su tutte le email!

Rated 3 out of 5 stars (1)
118 users

RepSel: Reply to all selected mails

Reply to all selected messages with a single button press. E.g., compose a reply to all emails in a folder or those matching a search. Req. permissions: menues to add UI, messageRead to get sender, compose to add recipients, storage for settings.

Rated 4 out of 5 stars (3)
114 users

Stop Ignoring Reply:To Requires Restart

Default "Reply" functionality pays attention to "Reply-To" in original email

Rated 5 out of 5 stars (12)
106 users