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.
3,843 users -
*cloud - FileLink for Nextcloud OpenCloud ownCloud
Upload large attachments to your Cloud and send the link by email
41,127 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.123,872 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft80,086 users -
Check your emails for spelling and grammar issues77,385 users -
Switch the signature on/off or choose a new one from your predefined set.56,389 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).55,423 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.)55,141 users
Top Rated See all »
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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。401 users -
Macro Template is to replace mail templates with macros for date formatting.617 users
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Default "Reply" functionality pays attention to "Reply-To" in original email52 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).40,169 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft80,086 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.93 users
Recently Added See all »
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Look up flexible workspace prices for a city from the message or compose window. Public CoworkingView Price Index, CC BY 4.0. Sends the city slug to api.coworkingview.com. Does not read messages.0 users -
Translate incoming emails and outgoing replies in Thunderbird with Microsoft or Google. No API keys required.9 users -
Render LaTeX equations locally in Thunderbird, preview them, and insert PNGs. Adjust color, size, and layout; edit equations and save custom macros. Interface: English, French, German, Italian, Spanish, and Greek.0 users -
Set the exact font size in px or pt and the line spacing while writing an email — for the selected text or for the whole message.23 users -
Not All Dark gives Thunderbird a quiet, neutral dark-gray look with no bright accents. But not everything goes dark: emails stay on a clean white background, both when you read them and when you write them. No settings, no data collected.24 users -
Free, open-source spelling and grammar checker for your emails, in English and French. Underlines your mistakes as you write and fixes them in one click. 100% local: your messages never leave your computer.9 users
See all 397 extensions in Message Composition »
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