This file is indexed.

/usr/share/xscreensaver/config/starfish.xml is in xscreensaver-data-extra 5.36-1ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="starfish" _label="Starfish">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=atwc7IJHuLo"/>

  <select id="mode">
    <option id="random" _label="Random"/>
    <option id="zoom"   _label="Color gradients" arg-set="-mode zoom"/>
    <option id="blob"   _label="Pulsating blob"  arg-set="-mode blob"/>
  </select>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="duration" type="slider" arg="-duration %"
          _label="Duration" _low-label="1 second" _high-label="30 seconds"
          low="1" high="60" default="30"/>

  <number id="thickness" type="slider" arg="-thickness %"
          _label="Lines" _low-label="Thin" _high-label="Thick"
          low="0" high="150" default="0"/>

  <number id="ncolors" type="slider" arg="-colors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="200"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
Undulating, throbbing, star-like patterns pulsate, rotate, and turn
inside out.  Another display mode uses these shapes to lay down a
field of colors, which are then cycled.  The motion is very organic.

Written by Jamie Zawinski; 1997.
  </_description>
</screensaver>