Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
28,549 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft65,497 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).45,142 users -
Check the message contents and addresses before you send the message...16,207 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).12,946 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.141 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"4 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft65,497 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.429 users -
Removes comment, display name automatically from addresses before sending mail.184 users
Recently Added See all »
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Przekazuje podejrzana wiadomosc do CERT Polska jako zalacznik .eml.0 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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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.2 users -
Email inbox cleanup: sender statistics, bulk deletion, newsletter unsubscribing, and automatic cleanup rules.30 users -
Gmail-style Undo Send for Thunderbird — delay outgoing mail 5–60 seconds and cancel before it goes out .
configurable delay, undo from notification/queue, dark mode, no network, no telemetry69 users
See all 251 extensions in Privacy and Security »
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