Make Firefox's minimize/maximize/close buttons to white for using Firefox's dark theme, in DE's white theme (KDE Breeze)

userChrome.css

#titlebar-min,
#titlebar-max,
#titlebar-close {
	/* -moz-appearance: -moz-window-button-minimize !important; */
	-moz-appearance: none !important;
	list-style-position: outside;
	-moz-image-region: rect(0, 18px, 18px, 0);
	padding: 0px 0px 0px 0px !important;
	margin: 0px 0px 0px 4px !important;
}

#titlebar-min:hover,
#titlebar-max:hover,
#titlebar-close:hover {
}

#titlebar-min {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-minimize.png");
}

#titlebar-max {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-maximize.png");
}

#titlebar-close {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-close.png");
}

#titlebar-min:hover {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-minimize-hover.png");
}

#titlebar-max:hover {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-maximize-hover.png");
}

#titlebar-close:hover {
	list-style-image: url("file:///usr/share/themes/Breeze-Dark/assets/titlebutton-close-hover.png");
}