Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
12,257 users
Most Popular See all »
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OpenPGP message encryption and authentication for Thunderbird.66,310 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft63,459 users -
Check the message contents and addresses before you send the message...16,776 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).10,797 users
Top Rated See all »
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Adds metadata and sortable tags to the password manager.25 users
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Adds the ability to create and edit entries in the password manager.553 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"29 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft63,459 users
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Remove comment, display name from addresses before sending mail.
This add-on is a fork of Auto Address Cleaner.
https://addons.thunderbird.net/thunderbird/addon/auto-address-cleaner/5,512 users -
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.2,244 users
Recently Added See all »
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Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).4 users -
Updates the local OpenPGP Alias file from a server to simplify encryption for mailing lists, or email aliases in an organizational environment.
Please make sure config parameter "mail.openpgp.alias_rules_file" is set to "openpgp_alias.json".60 users -
- 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".30 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!213 users -
Replace URLs which have been rewritten by Office 365 Advanced Threat Protection with the original URL.79 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.335 users
See all 158 extensions in Privacy and Security »
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