This file is indexed.

/usr/share/xul-ext-controlaula/defaults/preferences/prefs.js is in controlaula 1.8.0-3.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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pref("extensions.ControlAula.port", "8900");
pref("extensions.ControlAula.url", "http://localhost");
pref("extensions.ControlAula.isTeacher", false);
// https://developer.mozilla.org/en/Localizing_extension_descriptions
pref("extensions.jredrejo@debian.org.description", "chrome://ControlAula/locale/overlay.properties");