Add-ons
Calendar and Date/Time
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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.
Lightning Colors Reminder
Requires Restart
Let's show the calendar color on Lightning reminders!
SanRockstar
G-Hub Lite
Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
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.
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)
NirvanaHQ
Iranian Date For Thunderbird
Requires Restart
Adds a new Iranian(Persian/Jalali) date column to Thunderbird.
Google Calendar Tab
StormCows
Requires Restart
Allows two-way access between Remember The Milk and calendar events or todo items.
mailmindr
Follow up for Thunderbird E-Mails.
Web: https://mailmindr.net/
Twitter: @mailmindr
Purge Events Plus
Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
Outlook/Teams Appointments
Get the hidden appointment from an email from outlook/teams as a .ics-file - Icon: https://fontawesome.com/
Lightning Invitation Notifier | LIN
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
Montezooma
Requires Restart
Montezooma is a Thunderbird Addon that adds zooming functionality to windows.
lightningWeather
Requires Restart
LightningWeather shows the weather forecast in the background of the calendar so you can easily coordinate your activities with the weather.
Task Me (activity logger)
Requires Restart
Activity logger (sampled task monitoring) which uses calendar to store user's activities.
It periodically displays window with textbox where user can put description of currently performed tasks. The description is saved in a calendar.
Simple Week View
M-Hub Lite
Add Microsoft Office 365 Tabs to Thunderbird! Services supported by M-Hub Lite: Calendar, People, OneDrive, Word, Excel, PowerPoint, & Bing. Need business or enterprise support? Get M-Hub Pro: https://www.schiffner.com/software/m-hub-pro
To create your own collections, you must have a Mozilla Add-ons account.
