/etc/firejail/firefox-nightly.profile is in firejail-profiles 0.9.52-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # Firejail profile for firefox-nightly
# This file is overwritten after every install/update
# Persistent local customizations
include /etc/firejail/firefox-nightly.local
# Persistent global definitions
include /etc/firejail/globals.local
# Redirect
include /etc/firejail/firefox.profile
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