Single post in [CSS] One Button Fields, Egg Labels, Typeless Field Variants

I LOVE THIS but i have to switch to chrome for the one-click fields :( the button shows up on firefox but it doesn't change automatically like it should, i've tried a few different methods (custom skin, qol, stylus extension, i already set the css layout thing in the settings to true) but it just doesn't want to work properly on firefox idk if firefox just doesn't like css or what :\