Newest Extensions
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Muted Sage Gruvbox Light
Muted Sage Gruvbox light theme for Thunderbird.
Forked from Merlin's Muted Sage Gruvbox Dark theme, forked from calvinchd's gruvbox dark theme.
Uses Morhetz's Gruvbox colour scheme https://github.com/morhetz/gruvbox?tab=readme-ov-file

Autumn Blush
A warm theme of a wood changing its colors, in red, orange and khaki.

Greeny Lemon
A refreshing theme with a delicate citrus flavor in yellow and green.

Retro Cyborg
A distinctive theme referring to retro arcade games in turquoise and blueviolet.

Irish Coffee
Elegant and mellow theme for true gentlemen in different shades of brown.

Pistachio Ocean
Light and fresh, calming theme in pistachio and bright blue colors - not only for medics.

Nord Hardt
An arctic, north-bluish dark, clean and elegant color scheme for Thunderbird 128+.

Vioorange Warm
Warm, cozy, bright theme in violet and orange, ideal for winter or autumn.

MintGreen Dark Soft
This theme matches well with LinuxMint and Cinnamon Theme.
Use an add-on like Darko to darken the message body.
Originally written for Firefox.
Thanks to calvinchd at calch.themes.thunderbird.net for original Gruvbox Dark.
Tested up to v128.

Classic BB Colors
Calm and simple, bright theme in classic blue and beige colors.

New Year's Eve Theme
Celebrate New Year's Eve with this festive Thunderbird theme featuring fireworks and sparkling visuals.

Blurple
Blurple: A calming blend of blue and purple.
Start blurpmaxxing today.

Modern Theme Green
Modern Theme Green thats easy for the eyes and ported from Firefox for a seemless web experience.

Modern Theme
Seemless experience for Firefox & Thunderbird!
The Modern Theme aims for a lightweighted and eye-friendly design. Based on Dark Mode, it uses a contrasty combination of a unique blue-green-turquoise blend combined with sunset orange.

Dark Shadows XT
Quite dark theme, based on shades of grey colors, with blue and green accents.

3DTriangles
A Mozilla Thunderbird theme with 3D Objets and transparent design
To create your own collections, you must have a Mozilla Add-ons account.