Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
12,565 users
Most Popular See all »
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OpenPGP message encryption and authentication for Thunderbird.78,814 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft68,641 users -
Check the message contents and addresses before you send the message...18,664 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).12,249 users
Top Rated See all »
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Adds metadata and sortable tags to the password manager.29 users
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Adds the ability to create and edit entries in the password manager.641 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"32 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft68,641 users
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Removes comment, display name automatically from addresses before sending mail.1,122 users
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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.2,206 users
Recently Added See all »
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- SPAM Header Checker for OCN(Japanese Internet Provider)
- This plugin looks at the header of the mail and assigns a "junk mail" mark.
- Only if the header (X-CON-SPAM-CHECK) of the mail is set to 100%, it will be marked as "spam".9 users -
Just Report It (https://justreport.it) is an email plugin which tackles spam the right way. Report emails straight to SpamCop, the Registrar, a custom email address or any combination in between!129 users -
Replace URLs which have been rewritten by Office 365 Advanced Threat Protection with the original URL.78 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.299 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/pgpgeek156 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.50 users
See all 155 extensions in Privacy and Security »
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