Privacy and Security
Confirm mail address and attachments based on flexible rules.
WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.
Auto Password Registerer Requires Restart
Registers given passwords to Firefox/Thunderbird's password manager automatically.
Remove comment, display name from addresses before sending mail.
This add-on is a fork of Auto Address Cleaner.
Confirm E-mail address before sending mail
Check the message contents and addresses before you send the message...
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
DKIM Verifier Featured
Verifies the DKIM-Signature of an e-mail.
Asks for the master password at startup (fixes multiple password prompt)
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Identity Chooser helps you to always use the correct identity when composing a new email.
Auto Address Cleaner Requires Restart
Removes comment, display name automatically from addresses before sending mail.
Copy Folder Requires Restart
The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.
OpenPGP message encryption and authentication for Thunderbird.
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).
Identity Select Requires Restart
This extension allows you to choose the identity of your new email from a popup menu directly from the Write button. This feature behaves in a similar manner as the Get Mail pulldown menu. In addition, the default behavior of the Write button is...
CapsKiller Requires Restart
Caps Killer is a protection against newbies using caps in their mails.
Batch Copy Requires Restart
Batch Copy creates a local copy of your IMAP account, copies all messages and maintains folder structure. Batch Copy can run incrementally to copy only new messages.
Disable Signature Requires Restart
Allows to disable the S/MIME signature of messages. Afterwards, these messages are no longer recognized as signed and their attachments can be deleted or detached.