TB SystemCORE

by SystemOverload

27 Add-ons in this Collection

Lightning by Mozilla Calendar Project

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Provider for Google Calendar by Philipp Kewisch

Rated 4 out of 5 stars 1,029 reviews

339,810 users

Allows bidirectional access to Google Calendar

Enigmail by Patrick Brunschwig

Rated 4 out of 5 stars 188 reviews

161,920 users

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Google Calendar Tab by Bryan Clark

Rated 4 out of 5 stars 81 reviews

61,123 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

British English Dictionary by Mark Tyndall

Rated 3 out of 5 stars 425 reviews

198,859 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".

CompactHeader by jmozmoz

Rated 5 out of 5 stars 171 reviews

139,797 users

Add symbol in header plane to switch between compact and expanded view. Options to switch between one or two lines compact view, which buttons should be displayed in header pane. For Thunderbird 36 and older use version 2.0.9 (see version history)

Google Contacts by H.Ogi

Rated 3 out of 5 stars 313 reviews

45,709 users

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

Zindus by Leni Mayo

Rated 4 out of 5 stars 207 reviews

28,181 users

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

QuickFolders (Tabbed Folders) by Realraven (Axel Grude), Alexander Malfait

Rated 5 out of 5 stars 112 reviews

25,537 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!

Add-on Compatibility Reporter by Mozilla

Rated 4 out of 5 stars 213 reviews

68,581 users

Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.

Calendar Tweaks by DW-dev

Rated 4 out of 5 stars 55 reviews

15,181 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.

LocalFolder by philoux

Rated 4 out of 5 stars 9 reviews

9,378 users

Add as many local folders as you want to (like outlook PST).
NB. It doesn't import PST files.

Account Colors by DW-dev

Rated 4 out of 5 stars 95 reviews

11,712 users

Associates user-defined colors with 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.

Extra Folder Columns by Joey Minta, Thunderbird Development Team

Rated 4 out of 5 stars 248 reviews

141,282 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.

Contacts Sidebar by Jeroen Peters

Rated 4 out of 5 stars 275 reviews

33,029 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.
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