themes.json: add minimal arc

FirefoxCSS-Store / FirefoxCSS-Store.github.io

A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.

https://firefoxcss-store.github.io/

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Closed zayihu closed 1 month ago

zayihu commented 1 month ago

Hello! Add a theme, please.

BeyondMagic commented 1 month ago

Thank you for the contribution :)