Newest Extensions
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![](https://addons.thunderbird.net/user-media/version-previews/full/2/2891.png?modified=1719253212)
Modern Theme Green
Modern Theme Green thats easy for the eyes and ported from Firefox for a seemless web experience.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2888.png?modified=1718812612)
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.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2894.png?modified=1719597781)
Dark Shadows XT
Dark Shadows XT theme for Thunderbird by Nyquisteroux. Quite dark theme, based on shades of grey colors and optimized for enlarged Thunderbird interface - to see best results, set Density: Relaxed and Font Size: 15px in Thunderbird Options.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2825.png?modified=1714060731)
3DTriangles
A Mozilla Thunderbird theme with 3D Objets and transparent design
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2831.png?modified=1714162436)
Arc Theme for Thunderbird
Another Thunderbird theme inspired by the Arc theme.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2801.png?modified=1709321200)
Dark Space Thème 9MKR
Dark Space Thème 9MKR est un thème de couleur sombre avec une image de l'espace.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2798.png?modified=1709125919)
Mail Delivery 4K (2023)
Mail Delivery 4K (2023) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2795.png?modified=1709125893)
Mail Delivery 4K (2018)
Mail Delivery 4K (2018) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2792.png?modified=1709125867)
Mail Delivery 4K (Red)
Mail Delivery 4K (Red) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2789.png?modified=1709125837)
Mail Delivery 4K (Grey)
Mail Delivery 4K (Grey) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2786.png?modified=1709125808)
Mail Delivery 4K (2009 Alt)
Mail Delivery 4K (2009 Alt) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2783.png?modified=1709125775)
Mail Delivery 4K (2009)
Mail Delivery 4K (2009) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2780.png?modified=1709125711)
Mail Delivery 4K (2004)
Mail Delivery 4K (2004) theme for Thunderbird 100+ and 4K monitors.
![](https://addons.thunderbird.net/user-media/version-previews/full/2/2774.png?modified=1707453817)
KDE Breeze Dark - Mountains
A theme to fit KDE Breeze Dark, with automatic color selection, and using the new Mountains wallpaper
To create your own collections, you must have a Mozilla Add-ons account.