Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
23,744 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft73,013 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).48,076 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.)23,064 users -
Check the message contents and addresses before you send the message...20,022 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.198 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 Draft73,013 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.786 users -
Removes comment, display name automatically from addresses before sending mail.255 users
Recently Added See all »
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Display custom email headers in the mail header toolbar. This extension allows you to make visible specific headers in the toolbar, like received, date, DuckDuckGo's duck-original- headers to show the sender's email in the original format, etc.5 users
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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.net13 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.20 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.12 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.83 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.29 users
See all 187 extensions in Privacy and Security »
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