Calendar and Date/Time

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ReminderFox

ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Rated 4 out of 5 stars (532)
16,526 users
Updated Jan. 30, 2019

Send Later Requires Restart

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

Rated 5 out of 5 stars (139)
68,964 users
Updated Jan. 7, 2019

Show Outlook Appointments (vcal / ics) Requires Restart

An extension to show embedded Outlook calendar (vcal / ics) parts.

Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.

Not yet rated
0 users
Updated Jan. 7, 2019

Provider for Exchange ActiveSync

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

Rated 5 out of 5 stars (2)
6,536 users
Updated Dec. 10, 2018

Open Google Calendar Requires Restart

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

Rated 5 out of 5 stars (9)
2,023 users
Updated Dec. 2, 2018

TbSync

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 (43)
13,844 users
Updated Nov. 22, 2018

Purge Events Plus Requires Restart

Purge events from Sunbird and Lightning files and thereby cleanes the calendar

Rated 4 out of 5 stars (6)
393 users
Updated Nov. 21, 2018

Provider for CalDAV & CardDAV

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".

Rated 5 out of 5 stars (2)
3,532 users
Updated Nov. 19, 2018

NirvanaHQ Requires Restart

NirvanaHQ for Thunderbird

Not yet rated
11 users
Updated Nov. 11, 2018

lightningWeather Requires Restart

LightningWeather shows the weather forecast in the background of the calendar so you can easily coordinate your activities with the weather.

Rated 4 out of 5 stars (10)
1,690 users
Updated Nov. 6, 2018

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 (13)
23,749 users
Updated Nov. 1, 2018

Todo.txt Requires Restart

Thunderbird extension for the Todo.txt application

Rated 5 out of 5 stars (7)
522 users
Updated Oct. 30, 2018

Zonio Freebusy for Lightning Requires Restart

Finds when are people available for a meeting or event via Zonio Freebusy service. Displays freebusy blocks instantly in Invite Attendees window while attendees are being added. Works with both local calendar storage or any calendar provider.

Not yet rated
25 users
Updated Oct. 25, 2018

More Snooze Requires Restart

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

Rated 5 out of 5 stars (5)
816 users
Updated Sept. 24, 2018

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 (19)
184 users
Updated Aug. 15, 2018

Events spanning multiple days Requires Restart

Displays multiple day events as a "spanning" event, without borders of the day-elements inside the month- and multiweek-view.

Rated 2 out of 5 stars (2)
3 users
Updated July 24, 2018

Gantt View Requires Restart

Gantt Chart view for Sunbird/Lightning

Rated 4 out of 5 stars (31)
3,737 users
Updated July 2, 2018

EDS Calendar Integration Requires Restart

Integrates calendars events with Gnome clock applet

IMPORTANT:
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.

Rated 4 out of 5 stars (11)
705 users
Updated May 16, 2018

G-Hub Lite Requires Restart

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

Rated 4 out of 5 stars (14)
5,882 users
Updated April 26, 2018

Lightning Invitation Notifier Requires Restart

This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.

Rated 4 out of 5 stars (2)
2,238 users
Updated April 16, 2018