Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
21,356 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft64,756 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).43,153 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.)20,149 users -
Check the message contents and addresses before you send the message...17,503 users -
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).16,610 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.189 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 Draft64,756 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.726 users -
Removes comment, display name automatically from addresses before sending mail.226 users
Recently Added See all »
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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.2 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.5 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.36 users -
[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.222 users -
Before sending an e-mail, a pop-up window clearly displays check items such as the destination address, body text, and attached files, prompting the sender to confirm before sending the e-mail.308 users
See all 186 extensions in Privacy and Security »
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