hi i have problems on latest elementary OS with graphics on DELL G7 with graphic card geforce rtx 2060 latest driver and i have shadow on screen when i start new new window within firefox aplication ..on left top part theres a black shadow folowing the screen.
sorry I don't have that graphics card and I'm not an expert in this area. However this may help. Check you have the latest firefox (according to this you can turn on or off the GLX, which maybe causing your problem). https://www.omgubuntu.co.uk/2020/08/firefox-80-release-linux-gpu-acceleration only other suggestion i have is to try chrome. Sorry.
