Calendar and Date/Time

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Provider for Exchange ActiveSync Requires Restart

Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync

Rated 5 out of 5 stars (11)
19,146 users

Send Later Requires Restart Featured

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (175)
77,183 users

Provider for CalDAV & CardDAV Requires Restart

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, Google, ownCloud, Nextcloud, Radicale and many more.

Rated 5 out of 5 stars (22)
21,682 users

TbSync Requires Restart Featured

TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.

Rated 5 out of 5 stars (89)
39,626 users

Enhanced Date Formatter Requires Restart

Configure the 'Date' and 'Received' columns and displayed date in the message pane using custom formats. You can even use different date formats for emails with today's date, yesterday's date, dates in the last week, or dates older than a week.

Rated 5 out of 5 stars (11)
78 users

More Snooze Requires Restart

This add allow to customize the snooze delay when snooze popup appears (lightning required).

Rated 5 out of 5 stars (6)
783 users

Show Calendar Week Requires Restart

Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.

Rated 5 out of 5 stars (6)
49 users

Google Calendar Tab

Adds a button to open Google Calendar in a new Tab

Rated 5 out of 5 stars (2)
902 users

Gantt View Requires Restart

Gantt Chart view for Sunbird/Lightning

Rated 4 out of 5 stars (34)
614 users

EDS Calendar Integration Requires Restart

Integrates calendars events with Gnome clock applet

Rated 4 out of 5 stars (12)
692 users

LCD Clock Requires Restart

displays a LCD Clock in your Toolbar

Rated 4 out of 5 stars (26)
31 users

Open Google Calendar

Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)

Rated 4 out of 5 stars (49)
23,444 users

AdvancedTasks Requires Restart

Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.

Rated 4 out of 5 stars (8)
183 users

ReminderFox Requires Restart

ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.

Rated 4 out of 5 stars (544)
12,207 users

MultiBirthdaysReminder Requires Restart

This addon is now integrated into the new address book CardBook and thus it is no longer maintained

Rated 5 out of 5 stars (6)
10 users

Reply Monitor Requires Restart

**This is NOT COMPATIBLE with Thunderbird 31 or newer versions**
Keep track of your emails and replies (Lightning is required).
Note: the name of this add-on has been changed to Reply Monitor because the previous name is a registered trademark.

Rated 4 out of 5 stars (20)
45 users

SanRockstar Requires Restart

Music

Rated 5 out of 5 stars (3)
1 user

Lightning Calendar Tabs Requires Restart

Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.

Rated 4 out of 5 stars (15)
21,152 users

G-Hub Lite

Add Google Tabs to Thunderbird! Services supported by G-Hub Lite: Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need G Suite / Google Apps support? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (14)
5,368 users

StormCows Requires Restart

Allows two-way access between Remember The Milk and calendar events or todo items.

Rated 4 out of 5 stars (10)
17 users