Calendar and Date/Time
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NoiaButtons [Tb45-58] (discontinued)
The 'NoiaButtons' add-on offers cartoonish toolbar button icons (known from Noia themes) for default theme and lightweight themes. Further more lite silver and dark versions of Noia themes are included.
TbSync
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
Send Later
Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Provider for CalDAV & CardDAV
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".
AdvancedTasks
Requires Restart
Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.
Show Calendar Week
Requires Restart
Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.
Provider for Exchange ActiveSync
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync
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, ...)
EDS Calendar Integration
Requires Restart
Integrates calendars events with Gnome clock applet
IMPORTANT:
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.
MultiBirthdaysReminder
Requires Restart
This addon is now integrated into the new address book CardBook and thus it is no longer maintained
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.
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.
More Snooze
Requires Restart
This add allow to customize the snooze delay when snooze popup appears (lightning required).
Purge Events Plus
Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
StormCows
Requires Restart
Allows two-way access between Remember The Milk and calendar events or todo items.
Macro Template
Macro Template is to replace mail templates with macros for date formatting.
To create your own collections, you must have a Mozilla Add-ons account.