I can confirm the same behaviour on Lenovo Thinkpad T490 with Intel UHD 630 + Nvidia MX250, default Gnome desktop. The bug occurs in Firefox when watching video fullscreen. It does not occure in Chromium.
I can confirm the same behaviour on Lenovo Thinkpad T490 with Intel UHD 630 + Nvidia MX250, default Gnome desktop. The bug occurs in Firefox when watching video fullscreen. It does not occure in Chromium.