Calendar and Date/Time

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Lightning Colors Reminder

Let's show the calendar color on Lightning reminders!

Not yet rated
2,797 users

Show Calendar Week

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

Rated 5 out of 5 stars (4)
3,538 users

Reply Monitor

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)
1,737 users

Lightning Featured

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.

Rated 3 out of 5 stars (1,900)
6,361,479 users

Lightning Calendar Tabs

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 (8)
28,860 users

G-Hub Lite

Add Google Tabs to Thunderbird! Services supported: Voice, Calendar, Drive, Docs, Sheets, Slides, Hangouts, Plus, Photos, Contacts, News, Maps, & many more. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (3)
3,838 users

More Snooze

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

Rated 5 out of 5 stars (5)
1,456 users

Send Later

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

Rated 5 out of 5 stars (45)
67,762 users

Purge Events Plus

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

Rated 4 out of 5 stars (9)
1,252 users

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (107)
13,179 users

Montezooma

Montezooma is a Thunderbird Addon that adds zooming functionality to windows.

Rated 3 out of 5 stars (8)
961 users

Copy Reminder List To Clipboard No Restart

Provides button to copy the list of current reminders to the clipboard.

Not yet rated
49 users

Zonio Freebusy for Lightning

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
2 users

SanRockstar

Music

Rated 5 out of 5 stars (3)
60 users

Task Me (activity logger)

Activity logger (sampled task monitoring) which uses calendar to store user's activities.

It periodically displays window with textbox where user can put description of currently performed tasks. The description is saved in a calendar.

Rated 5 out of 5 stars (1)
29 users

StormCows

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

Rated 4 out of 5 stars (10)
462 users

MiniWebView Sidebar

Sidebar that shows a single web page. This allows Thunderbird to be augmented with any user-supplied or third-party web page. The screenshot shows an example - I use my own custom web page to present my Google Calendar in my preferred format.

Rated 5 out of 5 stars (4)
80 users

OBM Connector

OBM Lightning Calendar and addressbooks connector

Not yet rated
940 users

DM Sync

This plugin allows you to synchronize addressbooks and contacts stored on the DM mail server

Not yet rated
13 users

Macro Template No Restart

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (1)
380 users