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.
3,652 users -
*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
35,444 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.107,148 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft71,199 users -
Check your emails for spelling and grammar issues69,289 users -
Switch the signature on/off or choose a new one from your predefined set.53,044 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.50,541 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).46,815 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,693 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。517 users -
Macro Template is to replace mail templates with macros for date formatting.534 users
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Default "Reply" functionality pays attention to "Reply-To" in original email78 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).45,875 users -
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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Adds a button in the toolbar for Google Messages Web. Icon source: https://www.flaticon.com/free-icon/comment_94492004 users -
This extension uses OpenAI gpt-4o-mini to proofread emails when the user clicks the extension icon.
Usage requires an OpenAI API key. OpenAI does not offer a free usage tier. Proofreading a 4-5 paragraph email costs a fraction of a cent.9 users -
This extension uses Gemini Flash 2.0 to proofread emails when the user clicks the extension icon.
Usage requires a Gemini API key. There is a free usage tier that should be more than adequate for almost every user.10 users -
Automatically include attachments in email replies.
Skips SMIME certificates to avoid unnecessary attachments
Fügt automatisch Anhänge aus der ursprünglichen E-Mail hinzu.
Überspringt SMIME-Zertifikate, um unnötige Anhänge zu vermeiden.34 users -
ThunderAI Sparks is an add-on designed to add advanced features to ThunderAI.172 users -
Adds a button to the message composition window which updates recipient addresses to route the outbound message through addy.io or a self-hosted AnonAddy server, so your real, private email address isn't exposed to recipients.21 users
See all 217 extensions in Message Composition »
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