Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
28,206 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft77,597 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).53,539 users -
Confirm mail address and attachments based on flexible rules.
This is enterprise edition with less updates. Another edition for regular users:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail/24,691 users -
Check the message contents and addresses before you send the message...20,515 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.157 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 Draft77,597 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.785 users -
Removes comment, display name automatically from addresses before sending mail.222 users
Recently Added See all »
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MailCheck helps prevent accidental email leaks by checking recipient domains before sending. Can be configured to warn & allow users to deny when email messages include non-allowed domains or prohibited domains.0 users -
Download Gemini AI-generated images without a watermark.5 users -
View the source code of browser extensions from Chrome, Firefox, Opera, Edge, and other browsers. Works with CRX, XPI, and NEX files.0 users -
Spaces toolbar quick access Thunderbird Add-on for Tuta Calendar112 users -
Spaces toolbar quick access Thunderbird Add-on for Tuta Mail257 users -
Advanced email forensics. Maps hops, detects VPNs, and provides deep security analysis.68 users
See all 215 extensions in Privacy and Security »
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