Same as the above posts, settings are as per the wiki and saved, but the infinite scroll skin reappears. I see the settings page says some forums may override your skin choice, so some clarification on that would be helpful.

There's another intrusion at the bottom of the screen occasionally too, with a Forum Jump box. Is this related or do I need another fix to get rid of it?

Win 10 Home Edition, Firefox 51.0.14 (32 bit)