Add-ons
Message Composition
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*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
41,632 users -
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.
4,005 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.126,846 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft81,475 users -
Check your emails for spelling and grammar issues80,037 users -
Switch the signature on/off or choose a new one from your predefined set.59,050 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).55,195 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.)54,372 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text2,010 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。462 users -
Macro Template is to replace mail templates with macros for date formatting.595 users
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Default "Reply" functionality pays attention to "Reply-To" in original email59 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).48,342 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft81,475 users
Recently Added See all »
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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.3 users
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Summarize emails and refine selected text using your own AI API. Set your OpenAI-compatible endpoint and key in options; no built-in backend. Summarize when reading mail; Refine with one click in the compose toolbar, then Insert to replace the text.1 user -
When replying to an email this will set a "Customize From Address..." with the original recipient.
This is useful when using custom email addresses with plus addressing or a catch-all.
If a name is missing it will use the name of the set identity.1 user -
MailCheck helps prevent accidental email leaks by checking recipient domains before sending. Can be configured to warn & allow users to deny when email messages include non-allowed domains or prohibited domains.4 users -
Att-Hub is the ultimate attachment manager. Easily find, filter, organize, print, open, download (backup) or re-mail all your attachments in one gallery tab. Include Focus View, custom Containers, ZIP downloads and grid printing for images and PDFs.1 user
See all 289 extensions in Message Composition »
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