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.
3,491 users -
*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
36,957 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.109,750 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft70,091 users -
Check your emails for spelling and grammar issues69,961 users -
Switch the signature on/off or choose a new one from your predefined set.51,321 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.49,015 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).48,677 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,609 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。482 users -
Macro Template is to replace mail templates with macros for date formatting.558 users
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Default "Reply" functionality pays attention to "Reply-To" in original email67 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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AI-powered assistant for Thunderbird – summarize, reply, compose and translate emails with OpenAI. Requires your own OpenAI API key.1 user -
Compose emails using your favorite text editor.2 users -
Paste Excel tables directly into Thunderbird emails at the cursor. Preserves layout when possible, works with a toolbar button or Ctrl+Q shortcut, and auto-detects Excel data. Simple, fast, and no MS Word needed.24 users -
I missed an acoustic notification when an e-mail was sent and it seems (at least on MacOS) this is no native Thunderbird feature. So I created this quick, little AddOn which allows you to set an MP3 file that will be played if your message was sent.40 users -
This AddOn allows you to quickly resize images (like screenshots) you embed in a new mail to small, medium or large size with just a click in the composer window. This reduces e-mail size. The AddOn also estimates the size of your mail.199 users -
Provides a compose button in Thunderbird that creates AI-powered email replies with OpenAI. Offers settings for API key, model choice, and customization options.41 users
See all 245 extensions in Message Composition »
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