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
39,021 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.
3,867 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.1,21,860 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft76,924 users -
Check your emails for spelling and grammar issues76,286 users -
Switch the signature on/off or choose a new one from your predefined set.55,644 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).52,951 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.)51,736 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,947 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。443 users -
Macro Template is to replace mail templates with macros for date formatting.583 users
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Default "Reply" functionality pays attention to "Reply-To" in original email61 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).44,506 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft76,924 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.0 users
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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.2 users -
ToneCraft is a Thunderbird extension that detects (and blocks) unprofessional language in outgoing emails and suggests polite alternatives with AI.
It helps you maintain a courteous tone and avoid accidental rudeness.0 users -
Inline grammar suggestions while composing email. You bring your own LLM via an Open AI-compatible provider, including local LLM; tested with LM Studio on Ubuntu and together.ai Defaults to google/gemma-3n-E4B-it1 user -
Paste clipboard images inline in Thunderbird with PNG, JPG, or automatic format selection.9 users -
Sets a default font of your choice for every new composed e-mail.21 users
See all 291 extensions in Message Composition »
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