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 1,021 reviews

333,536 users

Allows bidirectional access to Google Calendar

Enigmail by Patrick Brunschwig

Rated 4 out of 5 stars 183 reviews

166,812 users

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Google Calendar Tab by Bryan Clark

Rated 4 out of 5 stars 79 reviews

69,214 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

Google Contacts by H.Ogi

Rated 3 out of 5 stars 311 reviews

70,615 users

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

Add-on Compatibility Reporter by Mozilla

Rated 4 out of 5 stars 213 reviews

84,029 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.

Extra Folder Columns by Joey Minta, Standard8

Rated 4 out of 5 stars 239 reviews

181,129 users

This extension is for those TB3 users who want the multiple-columns view that TB2 allowed

Contacts Sidebar by Jeroen Peters

Rated 4 out of 5 stars 273 reviews

38,808 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.

CompactHeader by jmozmoz

Rated 5 out of 5 stars 170 reviews

156,996 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 109 reviews

26,378 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 422 reviews

250,582 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".

Zindus by Leni Mayo

Rated 4 out of 5 stars 207 reviews

37,546 users

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

LocalFolder by philoux

Rated 4 out of 5 stars 8 reviews

9,913 users

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

Calendar Tweaks by DW-dev

Rated 4 out of 5 stars 54 reviews

16,076 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 90 reviews

11,358 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.
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