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.
3,925 users -
*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
39,637 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.121,204 users -
Check your emails for spelling and grammar issues76,539 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft76,292 users -
Switch the signature on/off or choose a new one from your predefined set.54,133 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).53,096 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.)50,879 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,426 users -
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。454 users -
Macro Template is to replace mail templates with macros for date formatting.582 users
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Default "Reply" functionality pays attention to "Reply-To" in original email56 users
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft76,292 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.95 users
Recently Added See all »
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Reply with quote without useless things (strip off images, signatures or old messages).
Minimal extension made after considering environmental impact of the size of exchanged mails between people.
Simple options. No unnecessary permission.0 users -
NestorAI is an AI assistant for Thunderbird that helps analyze email, prepare reply drafts, organize messages, and generate recaps, while also supporting local AI so processing can stay on the user's machine.3 users -
Send files directly from Thunderbird using PARAMANT — post-quantum encrypted, burn-on-read. Files are destroyed after first download. Requires a free PARAMANT API key.1 user
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This extension adds an ‘Undo Send’ feature to Thunderbird—just like Gmail’s Undo Send—giving you 10 seconds to cancel an email after clicking Send.20 users -
A lightweight Thunderbird add-on that allows you to add private comments to emails. These comments are stored as "Unsent Replies" directly within the same folder as the original message, ensuring your notes sync across all your devices.11 users
See all 299 extensions in Message Composition »
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