fix firefox display problem on Raspberry pi OS via xrdp remote

 

change the following 

Option 2)
By default Xrdp uses the /etc/ssl/private/ssl-cert-snakeoil.key file that is readable only by members of the “ssl-cert” group. Run the following command to add the xrdp user to the group :

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sudo adduser xrdp ssl-cert

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sudo nano /etc/X11/xrdp/xorg.conf

And find the line Option DRMDevice line and change it to
Option "DRMDevice" ""
reboot raspberry pi

reference

https://forums.raspberrypi.com/viewtopic.php?t=358637

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