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
39,302 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.
3,555 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.115,012 users -
Check your emails for spelling and grammar issues75,474 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft73,325 users -
Switch the signature on/off or choose a new one from your predefined set.52,519 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).52,473 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.)49,641 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,829 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。422 users -
Macro Template is to replace mail templates with macros for date formatting.535 users
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Default "Reply" functionality pays attention to "Reply-To" in original email64 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.95 users
Recently Added See all »
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GPT/Gemini/Claude対応。返信画面でワンクリック or ショートカットキーでAI返信を自動生成。トーン選択可能（前向き・お断り・カスタム）0 users
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Check your email with Gemini AI before sending.
A Thunderbird add-on that uses Google's Gemini AI to review your emails before sending. Get intelligent feedback on spelling, grammar, tone, clarity, and potential issues.5 users -
Automatically set From address to match email aliases when replying, with optional alias suggestion and identity creation0 users -
Send emails via SimpleLogin reverse aliases. Automatically replaces recipients with reverse aliases when sending from a SimpleLogin alias.2 users
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Send your message and automatically archive the original message being replied to. Use it via the button or shortcut Ctl+Shift+S. Set "sent" notifications on or off on the Add-on options page.0 users
See all 264 extensions in Message Composition »
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