Add-ons
Message Composition
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Reply with subaddress
Reply to a message that was sent to a subaddess with the same address.
Example: Your primary email is [email protected], you receive a mail to the subaddress [email protected], the sender of replies is set to [email protected].
MetaClean for Thunderbird
Removes metadata and hidden data in email attachments preventing the leakage of confidential information that occurs in this type of communication and avoiding possible economic and reputational damages derived from the malicious use of metadata.
Toggle Address Box
Adds a Address Box button, toggles the Address Box in the Composer window
Previous Colors
Quickly choose one of the previously selected colors for a message text
Arcus
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...
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.
Markdown Here Revival
A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.
Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.
Expand mailing lists
Adds an 'expand lists' button to the compose window. It replaces all mailing lists with their contacts.
FileLink Provider for Dropbox
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
SpamTester
SpamTester allows you to test the spam score of your email using popular anti-spam software (SpamAssassin, Rspamd...). This is useful to know if your email will fall into the recipient's spam (or even get your mail server blocked).
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.
✨ Awesome Emoji Picker ✨
Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.
You will certainly like it.
Add contact to CC by mentioning in body with @
Use @ to mention somebody on an email to link and add to the CC.
Limit non-BCC recipients
Check that number of non-BCC recipients does not exceed a parameter.
Owl for Exchange
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
regimail
AddOn for sending regimail with Thunderbird on Windows, MacOS and Linux.
*IMPORTANT:*
In order to use this AddOn, you need to install the regify client on your system and configure it with a valid regify account.
Google Messages Tab
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!
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.
To create your own collections, you must have a Mozilla Add-ons account.
