Calendar and Date/Time
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Date Time Formatter
Shows relative date-time in the column.
Note: you need to click "Select columns to display" and then -> "Relative Date/Time"
iCanban - Kanban with ICAL
Allday Tasks
Thunderbird lacks the ability to create and manage allday tasks. This add-on adds these capabilities.
Message Links 4 events
Allows to use links to messages in the description field of events and task
Calendar Tools: Gantt-/ Year View, Time Planner
Display Gantt View and Year View
Task Time Planning: daily, distribute your open tasks into open time slots.
Outlook Calendar - Quick Access
This extension adds a simple button to your Spaces toolbar that opens in a new tab, providing you with one-click access to Outlook Calendar.
More Snooze
This add allow to customize the snooze delay when snooze popup appears (lightning required).
Montezooma Requires Restart
Montezooma is a Thunderbird Addon that adds zooming functionality to windows.
Purge Events Plus Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
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.
StormCows Requires Restart
Allows two-way access between Remember The Milk and calendar events or todo items.
MiniWebView Sidebar Requires Restart
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.
DM Sync Requires Restart
This plugin allows you to synchronize addressbooks and contacts stored on the DM mail server
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.