Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
19 804 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft64 397 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).43 017 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.)20 390 users -
Check the message contents and addresses before you send the message...18 700 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.199 users -
Adds optional columns to the Thread Pane to allow sorting email messages by:
* Full sender address -- e.g. "[email protected]"
* 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 Draft64 397 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.720 users -
Removes comment, display name automatically from addresses before sending mail.248 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.20 users -
スパムメール、フィッシングメールなどの迷惑メールを判別して引っかからないように！
主に日本語向けの迷惑メールをターゲットにしています。
メールの削除はしません。
メールを指定フォルダに移動、迷惑メールフラグを立てます。89 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.224 users -
Always select the right identity with Identity Selector!17 users -
An efficient blocker. Easy on CPU and memory. New and updated filter list added.161 users -
Adds a button to unsubscribe from newsletters and other bulk email that has the List-Unsubscribe header.109 users
See all 182 extensions in Privacy and Security »
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