Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
31,191 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft78,231 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).50,377 users -
Check the message contents and addresses before you send the message...15,315 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).15,178 users -
Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.14,974 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.136 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 Draft78,231 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.489 users -
Removes comment, display name automatically from addresses before sending mail.165 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.0 users -
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.0 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.7 users -
Apply Duck relay addresses while composing email in Thunderbird.2 users -
Przekazuje podejrzana wiadomosc do CERT Polska jako zalacznik .eml.14 users
See all 255 extensions in Privacy and Security »
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