This file is indexed.

/usr/share/xscreensaver/config/webcollage.xml is in xscreensaver-screensaver-webcollage 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="webcollage" _label="WebCollage">

  <command arg="-root"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Delay between images" _low-label="None" _high-label="30 secs"
            low="0" high="30" default="2"/>

    <number id="timeout" type="slider" arg="-timeout %"
            _label="Network timeout" _low-label="2 secs" _high-label="2 min"
            low="2" high="120" default="30"/>
   </vgroup>
   <vgroup>
    <number id="opacity" type="slider" arg="-opacity %"
            _label="Image opacity" _low-label="Transparent" _high-label="Opaque"
            low="0.1" high="1.0" default="0.85"/>

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

   </vgroup>
  </hgroup>

<!--
  <string id="filter"  _label="Per-image filter program" arg="-filter %"/>
  <string id="filter2" _label="Overall filter program" arg="-filter2 %"/>
  <file id="dictionary" _label="Dictionary file" arg="-dictionary %"/>
  <file id="dir" _label="Image directory" arg="-directory %"/>
 -->

  <xscreensaver-updater />

  <_description>
This is what the Internet looks like.

This creates collages out of random images from the World Wide Web.
It finds the images by feeding random words into various search
engines, and pulling images (or sections of images) out of the pages
returned.

WARNING: THE INTERNET SOMETIMES CONTAINS PORNOGRAPHY.

The Internet being what it is, absolutely anything might show up in the
collage including -- quite possibly -- pornography, or even nudity.
Please act accordingly.

See also http://www.jwz.org/webcollage/

Written by Jamie Zawinski; 1999.
  </_description>
</screensaver>