Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
26 096 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft74 404 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).50 390 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/23 438 users -
Check the message contents and addresses before you send the message...19 330 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.164 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 404 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.757 users -
Removes comment, display name automatically from addresses before sending mail.223 users
Recently Added See all »
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![Icon for Tbpro Addon [STAGE]](https://addons.thunderbird.net/user-media/addon_icons/989/989140-32.png?modified=396606e7)
[THIS ADD-ON IS NOT AVAILABLE FOR PUBLIC USE]
This add-on is meant for internal testing of your Thunderbird Pro Add-on102 users -
Quickly shorten links with your self-hosted YOURLS instance. Provides a toolbar button, context menu, and keyboard shortcut for a fast workflow.1 user -
TO欄・CC欄に複数のメールアドレスがある場合の誤送信を防止します。送信前に自動的にチェックし、複数アドレスが検出された場合は警告を表示して送信を停止します。BCC欄の使用を推奨し、プライバシー保護を支援します。4 users -
Get notified when your mailbox space is almost full.
Mailbox Full Alert (MFA) is a Thunderbird addon that monitors mailbox usage and warns you when the configured quota is exceeded.32 users -
フィッシングメールの対策として
主に、メール内のリンク先のドメインをチェックし、
安全性を確認する。
Check the domain of the link in the email.6 users
See all 195 extensions in Privacy and Security »
To create your own collections, you must have a Mozilla Add-ons account.
