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
40,826 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.
3,934 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.120,069 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft78,707 users -
Check your emails for spelling and grammar issues76,326 users -
Switch the signature on/off or choose a new one from your predefined set.55,951 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).53,589 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.52,881 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,946 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。523 users -
Macro Template is to replace mail templates with macros for date formatting.610 users
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Default "Reply" functionality pays attention to "Reply-To" in original email67 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.99 users
Recently Added See all »
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Quick email template tool for daily/weekly/monthly reports. Features: customizable HTML templates, recipient presets, variable replacement. Privacy: all data stored locally, no external connections, no data collection.3 users -
Easily add custom borders to images in your emails.
Upon installation, predefined borders are available. You can delete, add, or modify styles.8 users -
Easily upload large attachments anonymously to FEX.net using the cloudFile API — fast, secure, and hassle-free.212 users -
AI-powered assistant for Thunderbird – summarize, reply, compose and translate emails with OpenAI. Requires your own OpenAI API key.2 users -
Compose emails in your favorite text editor such as Emacs, Neovim, Sublime, Vim, or VSCode via GhostText protocol6 users -
Paste Excel tables directly into Thunderbird emails at the cursor. Preserves layout when possible, works with a toolbar button or Ctrl+Q shortcut, and auto-detects Excel data. Simple, fast, and no MS Word needed.67 users
See all 246 extensions in Message Composition »
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