Calendar and Date/Time
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GCalTab
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.
Copy Timestamp
Copy the timestamp and/or email addresses of the sender, recipient, etc. to the clipboard in various formats.
Montezooma Requires Restart
Montezooma is a Thunderbird Addon that adds zooming functionality to windows.
Jalali Date Format Requires Restart
Convert Date/Received column to Jalali (Persian Date).
* Adds a column in the mail view for displaying Iranian dates for each email.
* Supports both English and Persian Iranian Date.
more info contact N3tD3vil@Yahoo.com
lightningWeather Requires Restart
LightningWeather shows the weather forecast in the background of the calendar so you can easily coordinate your activities with the weather.
marked-lightning
Extension for Lightning: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.
Telefonkonferenz.de-Vorlagen
Durch das Plug-in werden unsere praktischen E-Mail-Vorlagen Ihrer Thunderbird-Symbolleiste hinzugefügt
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)
Zonio Freebusy for Lightning Requires Restart
Finds when are people available for a meeting or event via Zonio Freebusy service. Displays freebusy blocks instantly in Invite Attendees window while attendees are being added. Works with both local calendar storage or any calendar provider.
Dropbox Paper
How Does It Work?
Once you install the add-on, a new icon will appear in the Thunderbird toolbar. Simply click on the icon, and it will open the Dropbox Paper tab.
Will the Dropbox Paper Add-on Collect My Data?
Never.
Purge Events Plus Requires Restart
Purge events from Sunbird and Lightning files and thereby cleanes the calendar
Events spanning multiple days Requires Restart
Displays multiple day events as a "spanning" event, without borders of the day-elements inside the month- and multiweek-view.
More Snooze
This add allow to customize the snooze delay when snooze popup appears (lightning required).
To create your own collections, you must have a Mozilla Add-ons account.