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
42,280 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.
4,121 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.128,487 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft82,088 users -
Check your emails for spelling and grammar issues81,325 users -
Switch the signature on/off or choose a new one from your predefined set.60,095 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).56,527 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.)55,659 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text2,054 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。498 users -
Macro Template is to replace mail templates with macros for date formatting.623 users
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Default "Reply" functionality pays attention to "Reply-To" in original email64 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).47,176 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft82,088 users
Recently Added See all »
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BYO AI Grammar is a Thunderbird add-on that provides inline grammar suggestions while composing email. You bring your own LLM, as long as it follows the OpenAI API (could use local LLM; untested). I use tiny and cheap google/gemma-3n-E4B-it0 users -
Paste clipboard images inline in Thunderbird with PNG, JPG, or automatic format selection.3 users -
Sets a default font of your choice for every new composed e-mail.7 users -
Add images via clipboard, drag & drop, or file import. Resize and convert image files to JPGs, automatically rename and number them. Sort, rotate, or edit your image attachments. All within the jpg-attacher add-on window.6 users -
The add-on enhances your email inbox experience through AI (LLM) support.12 users -
Manage and insert customized email templates with attachments directly from the compose window.36 users
See all 281 extensions in Message Composition »
To create your own collections, you must have a Mozilla Add-ons account.
