This file is indexed.

/usr/share/xscreensaver/config/popsquares.xml is in xscreensaver-data 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="popsquares" _label="PopSquares">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="25000"
          convert="invert"/>

  <number id="subdivision" type="spinbutton" arg="-subdivision %"
          _label="Subdivision"
          low="1" high="64" default="5"/>

  <number id="border" type="spinbutton" arg="-border %"
          _label="Border"
          low="0" high="5" default="1"/>

  <number id="ncolors" type="spinbutton" arg="-ncolors %"
            _label="Number of colors" low="1" high="512" default="128"/>

  <hgroup>
   <select id="bg">
    <option id="lred"     _label="Light red"     arg-set="-bg #FF0000"/>
    <option id="lyellow"  _label="Light yellow"  arg-set="-bg #FFFF00"/>
    <option id="lgreen"   _label="Light green"   arg-set="-bg #00FF00"/>
    <option id="lcyan"    _label="Light cyan"    arg-set="-bg #00FFFF"/>
    <option id="lblue"    _label="Light blue"/>
    <option id="lmagenta" _label="Light magenta" arg-set="-bg #FF00FF"/>
   </select>

   <select id="fg">
    <option id="dred"     _label="Dark red"     arg-set="-fg #8C0000"/>
    <option id="dyellow"  _label="Dark yellow"  arg-set="-fg #8C8C00"/>
    <option id="dgreen"   _label="Dark green"   arg-set="-fg #008C00"/>
    <option id="dcyan"    _label="Dark cyan"    arg-set="-fg #008C8C"/>
    <option id="dblue"    _label="Dark blue"/>
    <option id="dmagenta" _label="Dark magenta" arg-set="-fg #8C008C"/>
   </select>
  </hgroup>

  <boolean id="twitch" _label="Twitch" arg-set="-twitch"/>

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

  <xscreensaver-updater />

  <_description>
A pop-art-ish looking grid of pulsing colors.

Written by Levi Burton; 2003.
  </_description>
</screensaver>