Add-ons
Privacy and Security
Sort by:
Enigmail
Featured
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Confirm-Address
Check and Send
Requires Restart
Check the message contents and addresses before you send the message...
StartupMaster
Flex Confirm Mail
Requires Restart
Confirm mail address and attachments based on flexible rules.
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.
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
Identity Chooser
Requires Restart
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.
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.
MEGAbird
MailHops
Requires Restart
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
Saved Password Editor
Requires Restart
Adds the ability to create and edit entries in the password manager.
Check Domain
Requires Restart
This extension is to display the warning dialog when you send mail for multiple domains.
Correct Identity
Requires Restart
Ever sent mail from the wrong email address because you forgot to select the correct identity?
Encrypt if possible
Requires Restart
Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.
To create your own collections, you must have a Mozilla Add-ons account.
