Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
21,712 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft74,871 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).48,427 users -
Confirm mail address and attachments based on flexible rules.
(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)24,982 users -
Check the message contents and addresses before you send the message...22,377 users
Top Rated See all »
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Adds metadata and sortable tags to the password manager.10 users
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Adds the ability to create and edit entries in the password manager.215 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"6 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft74,871 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.789 users -
Removes comment, display name automatically from addresses before sending mail.285 users
Recently Added See all »
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[Alpha Testing] Thunderbird send allows sending and receiving end to end encrypted files.
This add-on is undergoing testing and not yet available to the general public.25 users -
This extension identifies and protects you from spam emails, phishing emails, and other unwanted messages. It is primarily targeted towards filtering out spam in Japanese.101 users -
Before sending an e-mail, a pop-up window clearly displays check items such as the destination address, body text, and attached files, prompting the sender to confirm before sending the e-mail.271 users -
Always select the right identity with Identity Selector!20 users -
An efficient blocker. Easy on CPU and memory. New and updated filter list added.168 users -
Adds a button to unsubscribe from newsletters and other bulk email that has the List-Unsubscribe header.119 users
See all 182 extensions in Privacy and Security »
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