TB SystemCORE

by SystemOverload

24 Add-ons in this Collection

Provider for Google Calendar by Philipp Kewisch

Rated 3 out of 5 stars 1,658 reviews

188,792 users

Allows bidirectional access to Google Calendar

Enigmail by Patrick Brunschwig

Rated 4 out of 5 stars 260 reviews

4,221 users

Helper tool to migrate your keys and important settings from Enigmail to Thunderbird 78.

CompactHeader by jmozmoz

Rated 5 out of 5 stars 191 reviews

15,326 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

Rated 3 out of 5 stars 413 reviews

2,298 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

Rated 5 out of 5 stars 190 reviews

14,884 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

Rated 4 out of 5 stars 83 reviews

2,025 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

Rated 3 out of 5 stars 307 reviews

11 users

Access to Google contacts and synchronize them with Thunderbird address books.

Account Colors by DW-dev

Rated 4 out of 5 stars 174 reviews

3,292 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

Rated 4 out of 5 stars 104 reviews

62 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

Rated 4 out of 5 stars 39 reviews

13,217 users

Add as many local folders as you want to.
New folders can reside on mapped or network locations.

Contacts Sidebar by Jeroen Peters

Rated 4 out of 5 stars 245 reviews

70 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

Rated 4 out of 5 stars 199 reviews

20 users

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Extra Folder Columns by Joey Minta, Thunderbird Development Team

Rated 4 out of 5 stars 214 reviews

118 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

Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.

JunQuilla by R Kent James, Christopher Leidigh

Rated 4 out of 5 stars 29 reviews

50 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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