Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
31,660 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft80,214 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).51,463 users -
Check the message contents and addresses before you send the message...16,647 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).15,505 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.137 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 Draft80,214 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.500 users -
Removes comment, display name automatically from addresses before sending mail.176 users
Recently Added See all »
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When attaching a file, subtly asks if the content should be encrypted. The file is packaged into an HTML file that self-decrypts using the passphrase. Runs entirely locally.1 user -
Traffic Light Protocol 2.0 (TLP 2.0): Marks emails according to the Traffic Light Protocol, including an additional CONFIDENTIAL level, directly in the Thunderbird compose window.1 user -
Never lose a tab again — one click vaults your open tabs, organized and searchable.0 users
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Warns when opening an email if the sender, links or attachments look unsafe. Everything runs locally. Suspicious emails can be reported to your own IT, newsletters from senders can be unsubscribed, and you are warned before replying to forged emails.2 users -
Right-click any link in Thunderbird to check it is alive. Link Probe probes the link and reports the HTTP status in a notification, so you never trust a dead link. Built by Scrap Labs.1 user
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Trace the origins of spam emails on a map.
See where an email really came from. Spam Trace analyzes message headers to estimate
spam/phishing risk — fully offline by default.11 users
See all 259 extensions in Privacy and Security »
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