This file is indexed.

/usr/share/xscreensaver/config/fireworkx.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="fireworkx" _label="Fireworkx">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=-l9BfvnFIPM"/>

  <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="maxlife" type="slider" arg="-maxlife %"
          _label="Activity" _low-label="Dense" _high-label="Sparse"
          low="0" high="100" default="32"/>

  <boolean id="flash" _label="Light flash" arg-unset="-no-flash"/>
  <boolean id="shoot" _label="Shells upward" arg-set="-shoot"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
Exploding fireworks.  See also the "Eruption", "XFlame" and "Pyro"
screen savers.

Written by Rony B Chandran; 2004.
  </_description>
</screensaver>