After instalation, navigate to any page that offers HTML5 video (examples:rumble,odysee, or thisYouTubescreenshot source), you'll see the minimized controller with the speed indicator in the upper left corner: Now you'll see a speed indicator in top left corner. On some sites, like YouTub...
https://www.youtube.com/watch?v=Lt_vn_fDqgQThe video explains how to set the view settings based on the screen display densities, so that at 100% view (if physical dimensions have been attributed) it shows actual print size. But mainly it help...