As a workaround, you can add the following to /etc/apparmor.d/local/usr.bin.firefox:
/usr/bin/Thunar Ux,
Then perform the following: sudo apparmor_parser -r /etc/apparmor.d/usr.bin.firefox
As a workaround, you can add the following to /etc/apparmor. d/local/ usr.bin. firefox:
/usr/bin/Thunar Ux,
Then perform the following: d/usr.bin. firefox
sudo apparmor_parser -r /etc/apparmor.