by SystemOverload

26 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 965 reviews

356,548 users

Allows bidirectional access to Google Calendar

Enigmail by Patrick Brunschwig

Rated 4 out of 5 stars 201 reviews

148,452 users

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

CompactHeader by jmozmoz

Rated 5 out of 5 stars 164 reviews

106,453 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)

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

Rated 5 out of 5 stars 121 reviews

23,075 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!

British English Dictionary by Mark Tyndall

Rated 3 out of 5 stars 407 reviews

130,965 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".

Google Contacts by H.Ogi

Rated 3 out of 5 stars 301 reviews

524 users

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

Calendar Tweaks by DW-dev

Rated 4 out of 5 stars 50 reviews

15,769 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.

Account Colors by DW-dev

Rated 4 out of 5 stars 82 reviews

13,586 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.

Google Calendar Tab by Bryan Clark

Rated 4 out of 5 stars 84 reviews

47,790 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

Close tab on ESC by David Winter

Rated 5 out of 5 stars 38 reviews

3,003 users

Closes a Mozilla Thunderbird tab when pressing the Escape key.

LocalFolder by philoux

Rated 4 out of 5 stars 12 reviews

9,602 users

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

Contacts Sidebar by Jeroen Peters

Rated 4 out of 5 stars 242 reviews

10,517 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

14,917 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

4,925 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.
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