This file is indexed.

/usr/share/xscreensaver/config/dangerball.xml is in xscreensaver-gl-extra 5.30-1+deb8u2.

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="dangerball" _label="DangerBall" gl="yes">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="30000"
          convert="invert"/>

  <number id="spikespeed" type="slider" arg="-speed %"
          _label="Spike growth" _low-label="Slow" _high-label="Fast"
          low="0.001" high="0.25" default="0.05"/>

  <number id="count" type="slider" arg="-count %"
          _label="Number of spikes" _low-label="Few" _high-label="Ouch"
          low="1" high="100" default="30"/>

  <hgroup>
   <boolean id="wander" _label="Wander"    arg-unset="-no-wander"/>
   <boolean id="spin"   _label="Spin"      arg-unset="-no-spin"/>
   <boolean id="wire"   _label="Wireframe" arg-set="-wireframe"/>
  </hgroup>

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

  <xscreensaver-updater />

  <_description>
A spiky ball. Ouch!

Written by Jamie Zawinski; 2001.
  </_description>
</screensaver>