Up & Coming Extensions
Bamboo Feed Reader Requires Restart
Feed reader | RSS - ATOM - OPML
Allow HTML Temp Requires Restart
This Add-on allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (if this is your default mode).
Shrunked Image Resizer Requires Restart
Make your photos smaller, so they don't take forever to email or send to websites.
Right Encoding Requires Restart
Adds the Character Encoding menu to the context menu
MRC Compose Requires Restart
Remplace la liste d'adresses par les champs standards (Pour, Copie à, Copie cachée à) avec l'autocomplétion.
Provides standards fields (TO, CC, BCC) with autocomplete to Thunderbird's compose pane.
For bug reports, please use support email.
.vcs Support Requires Restart
Import and export calendar files in vCalendar (.vcs) format
Adds icons to buttons and/or menus.
EnForward Requires Restart
Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).
This function can be invoked by "Forward to Evernote" in the context menu.
Google Keep for Thunderbird
TBDialOut Requires Restart
Place phone calls directly from Thunderbird's address book
Dropbox for Filelink (Broken) Requires Restart
Add Dropbox support to Thunderbird's Filelink feature.
This add-on is no longer maintained.
Copy Folder Requires Restart
The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.
Duplicate Contact Manager Requires Restart
Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.
Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.
Message Notes Plus Requires Restart
Message Notes Plus allows to add notes to emails. The notes don't affect the email in any way.
They are stored locally on your hard drive.
The commercial version of the add-on allows to share notes with other users: http://msgnotes.alehro00.com
SyncKolab Requires Restart
SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).
Subject Manager Requires Restart
Manages subject of composed emails.
Lightning Colors Reminder Requires Restart
Let's show the calendar color on Lightning reminders!
Email signature for Thunderbird - WiseStamp Requires Restart
Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more
Select Inbox Requires Restart
Automatically select the Inbox folder at startup, even if there is no account set to automatically check for new emails.
Important: the author will provide no other update for this add-on.