Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
30,667 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft75,467 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).49,521 users -
Check the message contents and addresses before you send the message...20,194 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).14,154 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.144 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"5 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft75,467 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.467 users -
Removes comment, display name automatically from addresses before sending mail.218 users
Recently Added See all »
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Apply Duck relay addresses while composing email in Thunderbird.1 user -
Przekazuje podejrzana wiadomosc do CERT Polska jako zalacznik .eml.3 users -
Warns before sending messages from an account to configured prohibited email addresses or domains.1 user -
Analyzes To and Cc recipients in the Thunderbird compose window.1 user
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Encrypt and decrypt the mail body in Thunderbird – no extra tab to the website.
✅ Modern mode
✅ Courier on/off: machine or bridge only
✅ Decrypted plaintext opens in its own tab – the original mail is not changed1 user -
Entra ID SSO for Thunderbird on Linux. A native messaging host bridges to the local microsoft-identity-broker, reusing the device SSO session for Microsoft 365 / Exchange (Conditional Access outside Edge). Companion host required.3 users
See all 251 extensions in Privacy and Security »
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