Calendar and Date/Time
Lightning Requires Restart
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.
Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, Google, ownCloud, Nextcloud, Radicale and many more.
Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync
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.
ReminderFox Requires Restart
ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.
Adds a button to open Google Calendar in a new Tab
Add Google Tabs to Thunderbird! Services supported by G-Hub Lite: Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need G Suite / Google Apps support? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
Lightning Colors Reminder Requires Restart
Let's show the calendar color on Lightning reminders!
Lightning Invitation Notifier Requires Restart
This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.
Todo.txt Requires Restart
Thunderbird extension for the Todo.txt application
More Snooze Requires Restart
This add allow to customize the snooze delay when snooze popup appears (lightning required).
EDS Calendar Integration Requires Restart
Integrates calendars events with Gnome clock applet
GCalTab is a Thunderbird add-on that opens Google Calendar website in a Thunderbird tab. It features a beautiful dark mode thanks to the DarkReader algorithm.
Custom sync interval for Lightning Calendar Requires Restart
Allows custom synchronization intervals for remote calendars imported by Lightning Calendar (no fiddling in about:config necessary)
OBM Connector Requires Restart
OBM Lightning Calendar and addressbooks connector
Purge Events Plus Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
Gantt View Requires Restart
Gantt Chart view for Sunbird/Lightning