Blue-Fox_by_Valdi

Tiger Tabby Cat

FFX Developer

Theme based on New Firefox logo family - Firefox Developer Edition Theme.

Quantum

Firefox Quantum

Mail Delivery 4K (2004)

Mail Delivery 4K (2004) theme for Thunderbird 100+ and 4K monitors.

Thunderbird Daily Suave

Based on the "Thunderbird Suave" theme by aramaicus.

Cat Collage

My cat Beeper can now delightfully viewed on Thunderbird.

Version 1.4 enhances the readability of text against my beautiful cat.

Colourful Bubbly

Based on Chromatic Flecks but as a 'light' theme

Endless Stars

My first Endless Stars Thunderbird Theme with Twinkling Stars. The only thing missing is the falling star animation.

New Dark Bird

A Thunderbird theme with the new Thunderbird Logo.

Shirasu Azusa Theme

Adds theme of Shirasu Azusa from game called Blue Archive.

Anime, Blue Archive, Cute, Dark, Game, Shirasu Azusa

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.

Jens Theme

Just a theme to enjoy in Thunderbird

Friul

Theme with the official Friulian Flag.

twilight dark

Dark violet theme

Mail Delivery 4K (2023)

Mail Delivery 4K (2023) theme for Thunderbird 100+ and 4K monitors.

Dark Space Thème 9MKR

Dark Space Thème 9MKR est un thème de couleur sombre avec une image de l'espace.

Mail Delivery 4K (2018)

Mail Delivery 4K (2018) theme for Thunderbird 100+ and 4K monitors.

Eldritch

Eldritch theme
https://github.com/eldritch-theme/thunderbird