Add-ons
Message Composition
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SmartTemplates
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
3,721 users -
*cloud - FileLink for Nextcloud OpenCloud ownCloud
Upload large attachments to your Cloud and send the link by email
40,244 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.121,706 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft78,695 users -
Check your emails for spelling and grammar issues75,477 users -
Switch the signature on/off or choose a new one from your predefined set.55,065 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).53,912 users -
Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)53,600 users
Top Rated See all »
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Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
それを実現するためのアドオンです。368 users -
Macro Template is to replace mail templates with macros for date formatting.570 users
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Default "Reply" functionality pays attention to "Reply-To" in original email53 users
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft78,695 users
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Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.93 users
Recently Added See all »
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Fixes Quicktext problems: doesn't require entire computer access and doesn't break all the time.
Has a subset of features: prepare snippets in html only, Ctrl+Shift+S to invoke (Cmd on mac).1 user -
If you write lengthy work emails, then this one's for you! Structure your emails with More/Less into a crisp summary, expandable side notes, and rabbit-hole appendices, handing over the power to the reader to either glance or dive deep.2 users
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Manage Fastmail out-of-office (vacation response) from Thunderbird.1 user
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E-Mails zusammenfassen, Antworten entwerfen und Texte verbessern mit winkk AI – direkt in Thunderbird. Erfordert ein winkk AI Abonnement.1 user -
Write better emails, faster. Generate editable AI drafts, summarize long messages, refine replies, and use trusted knowledge sources without leaving Thunderbird.1 user -
Lets AI apps on your computer, such as Claude Desktop, Claude Code, Codex and Cursor, work with your mail through the Model Context Protocol, within limits you set in the add-on's options. Needs the free host program from the project's releases page.3 users
See all 413 extensions in Message Composition »
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