Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
28,964 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft81,062 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).55,395 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/24,136 users -
Check the message contents and addresses before you send the message...20,620 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.159 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 Draft81,062 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.772 users -
Removes comment, display name automatically from addresses before sending mail.223 users
Recently Added See all »
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Basic extension to support add-on installation from addons.thunderbird.net, without requiring the privileged mozAddonManager API.0 users
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Browser Extension to bulk delete and archive ChatGPT chats.1 user -
Finally, an efficient blocker, now for Thunderbird! Easy on CPU and memory.2 users
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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.1 user -
Download Gemini AI-generated images without a watermark.7 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
See all 218 extensions in Privacy and Security »
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