Most Popular Extensions
Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)
DOM Inspector Requires Restart
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
Causes Thunderbird's main window to minimize instead of closing. You can still close Thunderbird through the menu.
Add emojis to your e-mails.
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
Persistent sticky notes for Thunderbird associated to mails.
In TB 78, you can define the note position in the settings. If you have a large screen, you can even display the notes outside of TB's main window, so it won't hide anything.
Check the message contents and addresses before you send the message...
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.
Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)
Uploads your large attachments to your Box instead of sending them by email.
Mailbox Alert allows you to specify, for each seperate mail folder, a message, sound and/or a system command that will be executed when new mail is found there. ...
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
Upload large attachments to your Cloud and send the link by email
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
DKIM Verifier Featured
Verifies the DKIM-Signature of an e-mail.
Add toolbar for toggling tags.
The best Translator for Thunderbird 78!
Available also for Firefox!
Phoenity icons for Thunderbird
Make your photos smaller, so they don't take forever to email.