Add-ons

CompactHeader by jmozmoz

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

FireTray by Foudil, Francesco S., others

A system tray extension for Linux and Windows, allowing to set up custom icon, hiding to tray instead of closing, display the number of unread messages in mailing applications, and other features ...

LightningButton by rsjtdrjgfuzkfg

Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.

Lightning Colors Reminder by Mic, James Hibbard

Let's show the calendar color on Lightning reminders!

Calendar Tweaks by DW-dev

Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.

Account Colors by DW-dev

Associates user-defined colors with POP3/IMAP accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.

Contact Tabs by thunderspeed

Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.

Lightbird by Exalm

Standalone calendar UI for Lightning

ThunderBirthDay by ingomueller.net

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Show Calendar Week by russa

Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.

funny owls by Digital Doodles