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
38,157 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.
3,668 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.116,978 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft73,746 users -
Check your emails for spelling and grammar issues73,582 users -
Switch the signature on/off or choose a new one from your predefined set.54,195 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).51,113 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.)49,693 users
Top Rated See all »
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Quickly choose one of the previously selected colors for a message text1,871 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。424 users -
Macro Template is to replace mail templates with macros for date formatting.553 users
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Default "Reply" functionality pays attention to "Reply-To" in original email57 users
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Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).44,649 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft73,746 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.2 users
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When replying to an email this will set a "Customize From Address..." with the original recipient.
This is useful when using custom email addresses with plus addressing or a catch-all.
If a name is missing it will use the name of the set identity.1 user -
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.4 users -
Bring Outlook-style mentions to Thunderbird. Type @ while composing to quickly find contacts, insert them into the message, and automatically add them to recipients. AutoMention Pro adds smarter ranking, recent contacts, CC/BCC routing and more.1 user -
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.1 user -
Cleanly forward emails in Thunderbird without bulky technical headers. Choose Gmail-style, Outlook-style, or minimal forwarding formats. Supports attachments, signatures, and advanced templates with Silk Forward Pro.1 user
See all 290 extensions in Message Composition »
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