Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
22,924 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft69,652 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).46,266 users -
Confirm mail address and attachments based on flexible rules.
(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)22,909 users -
Check the message contents and addresses before you send the message...18,948 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.203 users -
Adds optional columns to the Thread Pane to allow sorting email messages by:
* Full sender address -- e.g. "someone@example.com"
* Sender's domain -- e.g. "example.com"
* Sender's local part -- e.g. "someone"
* Sender's TLD -- e.g. ".com"6 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft69,652 users
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Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.
This plugin will change the URL back to the original value.752 users -
Removes comment, display name automatically from addresses before sending mail.239 users
Recently Added See all »
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[IMPORTANT] This is a pre-release version Thunderbird Send. We will gradually open it for beta testing.
This add-on is built and maintained by your friends at Thunderbird.
Stay tuned to updates on thunderbird.net14 users -
Adds a button to the message composition window which updates recipient addresses to route the outbound message through addy.io or a self-hosted AnonAddy server, so your real, private email address isn't exposed to recipients.19 users -
Convert your forwarding email and your DuckDuckGo Email Protection username to an email ready to be written to. Supports [at] and [dot] formats. The DuckDuckGo name, logos, trade dress, and other brand elements are trademarks of Duck Duck Go, Inc.10 users -
ReceivedHeaderInspector vous aide à analyser les serveurs d'envoi et à vérifier les domaines pour prévenir l'usurpation d'identité dans vos e-mails, simplifiant l’identification des serveurs sans devoir parcourir le code source des messages.70 users -
![Icon for Thunderbird Send [stage]](https://addons.thunderbird.net/user-media/addon_icons/988/988811-32.png?modified=b9d37650)
[Alpha Testing] Thunderbird send allows sending and receiving end to end encrypted files.
This add-on is undergoing testing and not yet available to the general public.30 users -
This extension identifies and protects you from spam emails, phishing emails, and other unwanted messages. It is primarily targeted towards filtering out spam in Japanese.295 users
See all 188 extensions in Privacy and Security »
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