That's a planned feature [1] - we'll probably add a new item to video menus which lets you flag a channel for reaction faces, then replace their thumbnails with

That's a planned feature [1] - we'll probably add a new item to video menus which lets you flag a channel for reaction faces, then replace their thumbnails with another frame from the video [1] https://github.com/insin/control-panel-for-youtube/issues/19 https://github.com/insin/control-panel-for-youtube/issues/19