In Firefox, click on the small "Picture in picture" button, then click on the "full-screen" corner button to make any of the videos full-screen. OK you don't ha

In Firefox, click on the small "Picture in picture" button, then click on the "full-screen" corner button to make any of the videos full-screen. OK you don't have the faces overlay, but you'll have a nice full-screen version of the presentation.