I have no control over dark or light mode. That is something you will have to change on your Firefox or settings. I wish I could figure this out because I am getting tons of mail about it! I I have asked an expert but so far haven't heard back. I will post on the forum and see what I can find out. I, too, like a dark background and have installed "Dark Background and Light Text" extension but it still doesn't change the New Page, only web sites. I am happy you like the theme, though. And thanks for the 5 stars.