Add-ons
TB SystemCORE
by SystemOverload
About this Collection
Essentials for Thunderbird
24 Add-ons in this Collection
Provider for Google Calendar
by Philipp Kewisch
183,454 users
Allows bidirectional access to Google Calendar
Enigmail
by Patrick Brunschwig
4,167 users
Helper tool to migrate your keys and important settings from Enigmail to Thunderbird 78.
CompactHeader
by jmozmoz
15,048 users
Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.
British English Dictionary
by Mark Tyndall
2,251 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
14,806 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!
Calendar Tweaks
by DW-dev
1,987 users
Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.
Google Contacts
by H.Ogi
12 users
Access to Google contacts and synchronize them with Thunderbird address books.
Account Colors
by DW-dev
3,242 users
Associates user-defined colors with POP3/IMAP accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.
Google Calendar Tab
by Bryan Clark
56 users
Adds the Google Calendar web interface as a new tab directly into Thunderbird. Creating and viewing events works just as it would in a browser like Firefox
LocalFolders
by philoux, Christopher Leidigh
13,092 users
Add as many local folders as you want to.
New folders can reside on mapped or network locations.
Contacts Sidebar
by Jeroen Peters
69 users
Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.
Visit my Contacts Sidebar site for recent versions and news.
Zindus
by Leni Mayo
20 users
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Extra Folder Columns
by Joey Minta, Thunderbird Development Team
117 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.
Hide Menubar
by yuoo2k
2 users
Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.
JunQuilla
by R Kent James, Christopher Leidigh
46 users
1) adds column with percent likelihood that a message is spam, 2) extends junk status column to show why a message was classified as junk/good, 3) adds an Uncertain folder for messages needing user decision.
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