I don't think Firefox Color can do that. At best you could test and set colors using Color, and then export the settings for both as a theme .zip or .xpi files, and then combine the two to a single manifest.json file. Inside the manifest, a "theme"
key would be color properties for "normal" theme and "dark_theme"
would be for dark-theme. After that you would submit the theme package to get it signed after which it can be installed as a real theme.
this post was submitted on 22 Jul 2024
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Thanks for the kind response! That's rather what I figured the ~ I'll take a crack at it later this week & maybe write a blog post about how to do it if I figure it out :)