This file is indexed.

/usr/share/xscreensaver/config/feedback.xml is in rss-glx 0.9.1-5ubuntu2.

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="feedback" _label="feedback">

  <command arg="-r"/>

  <boolean id="01" _label="Greyscale" arg-set="-g"/>

  <number id="02" type="slider" arg="-p %"
          _label="Color Period" _low-label="Faster" _high-label="Slower"
          low="1" high="100" default="5"/>

  <number id="03" type="slider" arg="-s %"
          _label="Warping Change Speed" _low-label="Slower" _high-label="Faster"
          low="1" high="100" default="10"/>

  <number id="04" type="slider" arg="-c %"
          _label="Cell Density" _low-label="Less" _high-label="More"
          low="0" high="6" default="3"/>

  <number id="05" type="slider" arg="-t %"
          _label="Texture Resolution" _low-label="Less" _high-label="More"
          low="6" high="12" default="8"/>

  <boolean id="06" _label="Warping Grid" arg-set="-i"/>

  <_description>
Stirring colors with a jiggling warp.

Written by Tugrul Galatali - &lt;http://rss-glx.sourceforge.net/&gt;.
  </_description>
</screensaver>