Privacy and Security

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Enigmail

OpenPGP message encryption and authentication for Thunderbird.

Rated 4 out of 5 stars (259)
76,721 users

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (194)
67,207 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 5 out of 5 stars (65)
28,914 users

Check and Send

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (40)
18,870 users

DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (30)
12,562 users

Signal Spam

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).

Rated 3 out of 5 stars (139)
12,436 users

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 4 out of 5 stars (9)
10,777 users

Allow HTML Temp

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).

Rated 4 out of 5 stars (74)
10,523 users

Identity Chooser

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 5 out of 5 stars (125)
6,263 users

Auto Address Cleaner T

Remove comment, display name from addresses before sending mail.

This add-on is a fork of Auto Address Cleaner.
https://addons.thunderbird.net/thunderbird/addon/auto-address-cleaner/

Rated 4 out of 5 stars (4)
5,540 users

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.

Rated 2 out of 5 stars (75)
2,980 users

WarnAttachment

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.

Rated 5 out of 5 stars (8)
2,118 users

MailHops

MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.

Rated 4 out of 5 stars (34)
1,974 users

StartupMaster

Asks for the master password at startup (fixes multiple password prompt)

Rated 4 out of 5 stars (307)
1,249 users

Auto Address Cleaner Requires Restart

Removes comment, display name automatically from addresses before sending mail.

Rated 5 out of 5 stars (56)
1,137 users

Bluhell Firewall

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Rated 4 out of 5 stars (497)
678 users

AlertSwitch

Turn on/off the alert shown when new message arrives.

Rated 4 out of 5 stars (3)
675 users

Saved Password Editor Requires Restart

Adds the ability to create and edit entries in the password manager.

Rated 5 out of 5 stars (389)
628 users

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

Rated 4 out of 5 stars (186)
556 users

Auto Password Registerer Requires Restart

Registers given passwords to Firefox/Thunderbird's password manager automatically.

Rated 5 out of 5 stars (2)
546 users