Most Popular Extensions
Adds tools to import/export messages and folders
Thunderbird v115 Support Available !
A little bumpy, but it will settle...
Allows bidirectional access to Google Calendar
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
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
True "Send Later" functionality to schedule the time for sending an email.
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
A new Thunderbird address book based on the CardDAV and vCard standards.
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Check your emails for spelling and grammar issues
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, ownCloud, Nextcloud, Radicale and many more.
Switch the signature on/off or choose a new one from your predefined set.
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).
The best Translator for Thunderbird!
FileLink provider for WebDAV Featured
Uploads your large attachments to your WebDAV account instead of sending them by email.
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).
Causes Thunderbird's main window to minimize instead of closing. You can still close Thunderbird through the menu.
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync
Upload large attachments to your Cloud and send the link by email