All of a sudden, now this plugin also sets the dark mode on all my websites... Really don't like this ...

This extension provides an easy and quick way to customize the colors in Firefox.

Firefox Colors represents the whole sad history of Firefox and Mozilla. Starting with the best of intentions, and then like a machine rolling through mud, accumulating sludge as it progresses till it is unrecognisable and impossible to use. Gets a good cleanup and starts all over again.
I agree with many of the others, who, like me, are frustrated at this stupid implementation. Every change appears to be irreversible. I have lost all my careful colour setups of versions past. Oh well, there are probably some idiots in a room somewhere patting themselves on the back and thinking they did a great job - so this won't change.
It's okay, we are almost at the point in the Firefox cycle where I drop off and walk with relief towards Chrome...

класс!!!

i like it