Calendar and Date/Time


Send Later

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

Rated 5 out of 5 stars (39)
57,364 users

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (106)
13,174 users

More Snooze

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

Rated 5 out of 5 stars (5)
1,396 users


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)
338 users



Rated 5 out of 5 stars (3)
60 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 (7)
26,972 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 (19)
1,508 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)
59 users


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

Rated 4 out of 5 stars (10)
472 users

Purge Events Plus

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

Rated 4 out of 5 stars (9)
1,057 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 (1,875)
5,482,608 users

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)
225 users

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)
3,192 users


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

Rated 3 out of 5 stars (8)
994 users

Macro Template No Restart

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

Rated 5 out of 5 stars (1)
309 users

Simple Week View

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

Rated 3 out of 5 stars (3)
467 users

Date on Thunderbird

在thunderbird statusbar显示年月日

Rated 4 out of 5 stars (1)
23 users


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)
543 users

Lightning Colors Reminder

Let's show the calendar color on Lightning reminders!

Not yet rated
15 users

Copy Reminder List To Clipboard No Restart

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

Not yet rated
15 users