You're welcome.
Today I had time to update this theme. It has a resolution of 3840x2160 pixels and a coloring scheme of all Firefox elements: tabs, sidebars, search bar, customization toolbar and pop-up menus. Unfortunately, Firefox won't let me load it because it is a "duplicate". I should according to them update the existing one. But doing so would displease users who like it, the way it is.... Dilemma! I need to look up how to do it.