Add-ons
Message Composition
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Send Later
Mail Merge
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Signature Switch
Switch the signature on/off or choose a new one from your predefined set.
FileLink Provider for Dropbox
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
Owl for Exchange
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
Emoji
*cloud - FileLink for Nextcloud and ownCloud
Featured
Upload large attachments to your Cloud and send the link by email
Grammar and Spell Checker — LanguageTool
Check your emails for spelling and grammar issues
ThunderHTMLedit
Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.
FileLink provider for Send
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).
FileLink Provider for Box
Uploads your large attachments to your Box instead of sending them by email.
Flex Confirm Mail
Shrunked Image Resizer
ReplyWithHeader
CategoryManager
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
Textmarker
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.)
Simple Mail Redirection
Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed
Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak
Please see the support page on how to use and why it sometimes does not work!
Identity Chooser
Identity Chooser helps you to always use the correct identity when composing a new email.
BorderColors D
Shows a colorful border around the "New Message" window, so you can tell different identities apart.
Builds on the original BorderColors and the "GT" version, adding different border styles.
To create your own collections, you must have a Mozilla Add-ons account.
