Calendar and Date/Time


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 (1,875)
54,124 weekly downloads

Send Later

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

Rated 5 out of 5 stars (39)
1,594 weekly downloads

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 (7)
822 weekly downloads

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (106)
503 weekly downloads

G-Hub Lite

Adds Google Tabs to Thunderbird. Services include Voice, Calendar, Drive (Docs), Contacts, Groups, News, Books, Play, Maps, Sites, Finance, Picasa, Plus. Need Google Apps? Check out G-Hub Pro:

Rated 3 out of 5 stars (17)
151 weekly downloads

Show Calendar Week

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

Not yet rated
123 weekly downloads

Lightning Reminder Left Buttons

Tired to mistakenly press that "Dismiss All" button? Move the Lightining Reminder "Snooze all for" and "Dismiss All" buttons to the LEFT!
... and from version 2.0 you can keep them on the RIGHT, but swapped!

Not yet rated
77 weekly downloads

Lightning Colors Reminder

Let's show the calendar color on Lightning reminders!

Not yet rated
61 weekly downloads

Purge Events Plus

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

Rated 4 out of 5 stars (9)
54 weekly downloads

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 (19)
52 weekly downloads

EDS Calendar Integration

Integrates calendars events with Gnome clock applet

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

Rated 4 out of 5 stars (4)
43 weekly downloads

Simple Week View

A simple week view for Lightning, as in the print layout.

Rated 3 out of 5 stars (3)
42 weekly downloads

More Snooze

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

Rated 5 out of 5 stars (5)
39 weekly downloads


Manage All Birthdays

Thanks to :
All donators for their very important support ;
All contributors with their remarks and translations ;
Sebastian Apel : this pluggin was inspired by its brilliant pluggin : Birthday Reminder

Rated 5 out of 5 stars (3)
38 weekly downloads

Macro Template No Restart

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

Rated 5 out of 5 stars (1)
27 weekly downloads

Copy Reminder List To Clipboard No Restart

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

Not yet rated
21 weekly downloads


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

Rated 4 out of 5 stars (10)
21 weekly downloads

OBM Connector

OBM Lightning Calendar and addressbooks connector

Not yet rated
16 weekly downloads


Helps to add emails more easily to your calendar. Suggests date and time information based on email content when converting to an event or a task. Depends on Lightning addon for calendaring.

Rated 2 out of 5 stars (7)
16 weekly downloads



Rated 5 out of 5 stars (3)
15 weekly downloads