I use KDE Plasma, and much prefer the KDE color picker over the GTK one that Firefox uses, with input type=color.
I know that I can set GTK_USE_PORTAL=1 to make Firefox use the native file picker, is there a way to make it use the native color picker as well?
I know there probably isn't a way, but I figured it's worth a shot asking.
Huge ripoff, nothing special
Okay then don't use it. The entire point of KDE is to provide a traditional desktop metaphor that windows users find friendly.
And if you're especially irked, KDE like most FOSS is somewhat community driven, so be the change you desire if that's your kind of thing. Or don't do anything but complain. You're completely free to do whatever.
But that said, you may perhaps be making a mountain out of a molehill, especially UI elements that if MS wanted to cite copyright, they would have done it long time ago. This has been the default color picker for KDE since the 2.x days.