Add-ons
Up & Coming Extensions
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Real System Theme
Theme that really follows system colors for Thunderbird 115+.
If you get strange colors instead of what you expect: First switch to the built in system theme, then switch to this theme again.
summersmile
Summersmile adds a lively flair to Thunderbird with a sunny yellow background, playful smiley graphics, and a "sunshine and smiles" theme that refreshes your email experience.
Abstract Theme Carole Pepper
An abstract Firefox theme of the charactor Carole Pepper of Honkai Impact 3rd. Inspired by the color of the character's default skin, including the character's skin tone and clothing color. The copyright owner of the charactor Carole is Mihoyo.
KDE Breeze Dark - Mountains
A theme to fit KDE Breeze Dark, with automatic color selection, and using the new Mountains wallpaper
Mail Delivery 4K (2004)
Mail Delivery 4K (2004) theme for Thunderbird 100+ and 4K monitors.
Mail Delivery 4K (2009 Alt)
Mail Delivery 4K (2009 Alt) theme for Thunderbird 100+ and 4K monitors.
Mail Delivery 4K (Grey)
Mail Delivery 4K (Grey) theme for Thunderbird 100+ and 4K monitors.
To create your own collections, you must have a Mozilla Add-ons account.
