Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
9,083 users
Most Popular See all »
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OpenPGP message encryption and authentication for Thunderbird.77,294 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft56,549 users -
Check the message contents and addresses before you send the message...12,917 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).10,372 users -
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).9,674 users
Top Rated See all »
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Adds metadata and sortable tags to the password manager.26 users
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Adds the ability to create and edit entries in the password manager.594 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"38 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft56,549 users
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Identity Chooser helps you to always use the correct identity when composing a new email.5,271 users
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Removes comment, display name automatically from addresses before sending mail.997 users
Recently Added See all »
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Just Report It (https://justreport.it) is an email plugin which makes it easy to report spam emails back to the domain registrar. This method ensures that spam domains are effectively being blocked at the registrar level and not just locally.30 users -
Replace URLs which have been rewritten by Office 365 Advanced Threat Protection with the original URL.55 users -
When using ProtonMail Bridge to integrate Mozilla Thunderbird withProtonMail, it's not easy to tell which emails were end-to-end (E2E) encrypted. This add-on puts an icon in the toolbar above every message to show you its encryption status.146 users -
Quick & easy PGP encryption / decryption tool
* Save & use many public encryption keys to encrypt mail content
* Save & use many private decryption keys to decrypt mail content
Using openPGP.js
Open Source
https://github.com/pgpgeek/pgpgeek103 users -
Diese Erweiterung überprüft ungelesene E-Mails auf Spoofingversuche. Die E-Mails werden mithilfe von fünf unterschiedlichen Tests untersucht um deren Legitimität festzustellen. Die Tests werden einzeln erklärt auf der Einstellungsseite.35 users -
Allows to disable the S/MIME signature of messages. Afterwards, these messages are no longer recognized as signed and their attachments can be deleted or detached.8 users
See all 154 extensions in Privacy and Security »
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