Markdown Here Requires Restart
Write your email in Markdown, then make it pretty. NOTE: This is the legacy XUL version, for Thunderbird, Postbox, Pale Moon, etc. *Not* for modern Firefox; for that use this: https://addons.mozilla.org/en-US/firefox/addon/markdown-here/
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
Emoji Requires Restart
Add emojis to your e-mails.
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.
ThunderHTMLedit Requires Restart
Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.
Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
Add menu commands for replying to multiple messages at the same time.
mms Auto Correct Requires Restart
AutoCorrect for the Compose window.
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.
MultiTemplateLoader Requires Restart
Manages & applies multiple HTML templates when creating/replying messages.
Templates may be either local files or online links (http:// or ftp://). Up to 9 templates can be defined and easily switched, also using shortcut keys.
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
ReplyWithHeader Requires Restart
Outlook style headers and few goodies for Thunderbird & Postbox.
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
EnForward Requires Restart
Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).
This function can be invoked by "Forward to Evernote" in the context menu.
Copy Message ID Requires Restart
Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
DL for Thunderbird Requires Restart
Allows to convert large attachments to links automatically without 3rd party providers.
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.