Most Popular Extensions

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ImportExportTools NG

Adds tools to import/export messages and folders

Thunderbird v115 Support Available !

Rated 4 out of 5 stars (205)
255 901 gebruikers

Provider for Google Calendar

Allows bidirectional access to Google Calendar

Rated 3 out of 5 stars (1 642)
207 681 gebruikers

LookOut (fix version)

LookOut decodes winmail.dat (TNEF encoded) files that may come from a misconfigured Microsoft Exchange server or Outlook user allowing access to the original attachments
Support: Thunderbird

Rated 4 out of 5 stars (93)
174 352 gebruikers

Quicktext

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Rated 4 out of 5 stars (460)
131 197 gebruikers

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (263)
103 721 gebruikers

Remove Duplicate Messages

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (288)
97 997 gebruikers

TbSync

TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.

Rated 5 out of 5 stars (251)
78 337 gebruikers

CardBook Uitgesoek

A new Thunderbird address book based on the CardDAV and vCard standards.

Twitter: @CardBookAddon

Rated 4 out of 5 stars (439)
77 223 gebruikers

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (225)
68 849 gebruikers

Grammar and Spell Checker — LanguageTool

Check your emails for spelling and grammar issues

Rated 4 out of 5 stars (29)
60 946 gebruikers

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (20)
53 199 gebruikers

Signature Switch

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (272)
50 616 gebruikers

Provider for CalDAV & CardDAV

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, ownCloud, Nextcloud, Radicale and many more.

Rated 5 out of 5 stars (54)
49 806 gebruikers

Owl for Exchange

Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).

Rated 5 out of 5 stars (187)
49 321 gebruikers

FileLink provider for WebDAV Uitgesoek

Uploads your large attachments to your WebDAV account instead of sending them by email.

Rated 3 out of 5 stars (19)
46 173 gebruikers

Web Translate

The best Translator for Thunderbird!

Supported translators:
Google Translate
Microsoft Translator
DeepL
Yandex
Яндекс Переводчик
Google 翻译
百度翻译

Rated 4 out of 5 stars (22)
45 389 gebruikers

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Rated 5 out of 5 stars (14)
43 075 gebruikers

Minimize on Close

Causes Thunderbird's main window to minimize instead of closing. You can still close Thunderbird through the menu.

Rated 4 out of 5 stars (77)
37 343 gebruikers

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.)

Rated 5 out of 5 stars (30)
37 075 gebruikers

*cloud - FileLink for Nextcloud and ownCloud Uitgesoek

Upload large attachments to your Cloud and send the link by email

Rated 5 out of 5 stars (47)
34 329 gebruikers