Theme color


Sorry for my english, i’ll try to be clear.
Before the update of mozilla firefox 92, i used a theme name “purple by alex” on my PC.

With this theme, the settings or addons or popups windows were dark (what i like)

I’d like to still use this theme, but with the update 92, there is a change, the popups windows went white).

I’d like to know how can I change it (I’m sure it’s possible but I don’t know how).

I precise I try to use the extension named “firefox color” where I recreate the theme manually, but I got another problem (I improve to have the popups windows in dark, but the settings are in light theme), and using “firefox color” does not seem to work well (when windows open, the theme do not open immediately, when I open new tabs, it lags, etc etc…)

Can someone please help me.

To resume, I’d like to use this theme, but have every windows with it, in dark theme (popups, settings, etc…)