/usr/share/xul-ext/lightbeam/defaults/preferences/prefs.js is in xul-ext-lightbeam 1.2.1+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | pref("extensions.jid1-F9UJ2thwoAm5gQ@jetpack.defaultVisualization", "graph");
pref("extensions.jid1-F9UJ2thwoAm5gQ@jetpack.defaultFilter", "daily");
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