Most Popular Extensions
Workspace for Thunderbird Requires Restart
A simple editor for executing snippets of JS. In Thunderbird.
Mail Sent Notifier Requires Restart
Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.
Filter SubFolders Requires Restart
Applies mail filters to sub folders of an IMAP account, not just the Inbox
Last Message Requires Restart
Navigate the folder to the last message in the moment the folder is opened.
SendToSecondEmail Requires Restart
This Extension lets you send Mails to both, first and second email address...
Soapy Requires Restart
Bypasses DNS-based censorship
NOTE: This was created as a SOPA protest in 2012. This does not work anymore for most sites. Use Tor instead.
Hide Clear List Button Requires Restart
Hide the "Clear List" Button in the Download Manager.
Mutt Keys Requires Restart
Creates Mutt like key bindings for Thunderbird. Inspired by the mouseless extension.
RSS Editor Requires Restart
Desktop RSS editor for casual editing of RSS 2.0...
Received Requires Restart
Displays the "Received" header parsed with a regular expression.
nowebsearch Requires Restart
Removes web search feature
Close Tab By Double Click Requires Restart
Close active tab by double-clicking it.
Identity Checker Requires Restart
This add-on checks to sender identity when send a message.
Inbox Cleaner of expired Emails Requires Restart
Moves expired Emails out of your Inbox!
rmIncomingDups Requires Restart
rmIncomingDups is a Thunderbird extension that checks if there are duplicate messages across accounts.
When a new mail arrives rmIncomingDups checks according to the rules configured if it finds some duplicates and removes them.
BccInfo Requires Restart
Send any additional information to your BCC recipient.
arXiv Requires Restart
Adds direct links to the article PDF and BibTeX information to arXiv email listings. BibTeX information can be used in reference managers such as JabRef by Copy & Paste.
Crash yourself with ease
Ethical signature Requires Restart
Add a button to the email composition toolbar, which lets you insert an ethical signature.