@algernon@come-from.mad-scientist.club I have to report that clicking all 3 buttons just sets the theme to the light background one that existed when I arrived. Might be LibreWolf blocking some cookie... in my normal Firefox with UBO I got it to work once, then not anymore. If you have logs I'm the guy with a mac and LibreWolf and Firefox and ~20 page hits in the last 3min on /theme/