/usr/share/lightdm-remote-session-uccsconfigure/firefox-uccsconfigure.sh is in lightdm-remote-session-uccsconfigure 1.1-0ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
firefox -no-remote https://uccs.landscape.canonical.com/
gnome-session-quit --logout --no-prompt
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