Add-ons
Thunderbird Goodness
by pgl
About this Collection
These addons solve specific issues with the vanilla Thunderbird installation. They are all highly recommended to make your life with Thunderbird spiffy.
24 Add-ons in this Collection
LookOut
by Aron Rubin
1,174 users
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Remove Duplicate Messages
by Eyal Rozenberg
98,675 users
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
British English Dictionary
by Mark Tyndall
2,397 users
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
QuickFolders (Tabbed Folders)
by Realraven (Axel Grude), Alexander Malfait
15,441 users
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
ReminderFox
by Tom Mutdosch, Daniel Lee, others
2,891 users
ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.
Remove Duplicate Messages
by Thorsten W. Schmidt
249 users
If you have duplicate messages (e.g. from merging folders or downloading messages several times) you can use this tool to find and remove them from the selected folder and its subfolder by rightclicking on a folder and choosing "Remove duplicates..."
Allow HTML Temp
by Alexander Ihrig
10,876 users
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
AutoCopy
by Autocopy, Michael Lidman
3 users
Select text and it's automatically copied to the clipboard. Also pastes on middle click.
Sieve
by Thomas Schmid
505 users
This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...
Quote Colors
by Malte Ruecker
129 users
Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.
Nostalgy
by Alain Frisch
1,011 users
Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.
Thunderbird Message Filter Import/Export
by Wind Li
6 users
Thunderbird Message Filter Import/Export is a thunderbird/mozilla extension to import/export message filters.
Mark All Read Button
by Mark S Baines
595 users
Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.
Extra Folder Columns
by Joey Minta, Thunderbird Development Team
127 users
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
IMPORTANT: If you are using Thunderbird 38 or later, uninstall this addon. The functionality is in core now.
FolderFlagsWhat are Collections?
Collections are groups of related add-ons that anyone can create and share.
Explore CollectionsTo create your own collections, you must have a Mozilla Add-ons account.
