Privacy and Security
Enigmail Requires Restart
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Mail Merge Requires Restart
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Confirm-Address Requires Restart
Confirm E-mail address before sending mail
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
Asks for the master password at startup (fixes multiple password prompt)
Signal Spam Requires Restart
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).
Allow HTML Temp Requires Restart
This Add-on allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (if this is your default mode).
DKIM Verifier Requires Restart
Verifies the DKIM-Signature of an e-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.
Identity Chooser Requires Restart
Identity Chooser helps you to always use the correct identity when composing a new email.
Master Password+ Requires Restart
Various enhancements for build-in "master password" (MP)
-Locks master security device on demand or after specified time
-Prompts for MP on browser startup
-Suppresses all or duplicate MP prompts
-Locks up entire application or individual windows
Secure Addressing Requires Restart
This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient's addresses upon sending, name and affiliation look up at mail composition and main windows, and safe auto completion.
Auto Address Cleaner Requires Restart
Removes comment, display name automatically from addresses before sending mail.
MEGAbird Requires Restart
Add MEGA support to Thunderbird's Filelink feature.
MailHops Requires Restart
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
Paranoia Requires Restart
Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)
Encrypt if possible Requires Restart
Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.
WarnAttachment Requires Restart
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.
Saved Password Editor Requires Restart
Adds the ability to create and edit entries in the password manager.