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.
4,012 users -
*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
39,171 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.118,895 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft78,486 users -
Check your emails for spelling and grammar issues76,178 users -
Switch the signature on/off or choose a new one from your predefined set.59,285 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.55,166 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).51,448 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,856 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。608 users -
Macro Template is to replace mail templates with macros for date formatting.602 users
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Default "Reply" functionality pays attention to "Reply-To" in original email81 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.106 users
Recently Added See all »
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Inserting file link to mail with optional password and expiration date3 users -
Adds a button in the toolbar for Google Messages Web. Icon source: https://www.flaticon.com/free-icon/comment_944920012 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.15 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.14 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.41 users -
ThunderAI Sparks is an add-on designed to add advanced features to ThunderAI.220 users
See all 218 extensions in Message Composition »
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