Running firefox 121 with Gnome I was hoping a problem that existed with earlier versions would be resolved. When the window protocol is wayland and the window is fullscreen (F11), playing video fullscreen causes the image to be "oversize" and only the upper-left quarter is shown. Doing the same thing with window protocol of xwayland results in fullscreen video displaying properly. I believe this is due to an issue with the way my 4k screen with 2x UI scaling is being reported to Firefox: Under xwayland, I get the following information for my display (Display0) 3840x2160@120Hz scales:1.000000|2.000000 When running wayland, I get 7680x4320@120Hz scales:2.000000|2.000000 Thanks in advance