Thunderbird 78 以降用に使えるテーマを練習用に作ってみました。
Very simple theme, which uses only public domain illustrations.
A Thunderbird theme inspired by the Arc theme.
A purple theme for Thunderbird
Breeze (Plasma 5) + logo of Arch Linux
Chocolate brown colored theme with a detail from an Illustration by Henry Holiday to Lewis Carroll's "The Hunting of the Snark"
Theme Designed by Shop Khoi Nghiep
A Thunderbird version of the popular Fireglobe theme for Firefox.
Breeze Light Theme for Thunderbird
A nice bright theme to use with Thunderbird beta versions (Earlybird)
An updated version with a Thunderbird 60 logo. Not sure what ESR68 is going to look l ike :)
yahane_pattern, BY: HEKISU1
A simple theme to give your computer the EMBL-EBI look.
Theme based on New Firefox logo family - Firefox Developer Edition Theme.