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/usr/share/xscreensaver/config/pyro.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="pyro" _label="Pyro">

  <command arg="-root"/>

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

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Slow" _high-label="Fast"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="count" type="slider" arg="-count %"
          _label="Particle density" _low-label="Sparse" _high-label="Dense"
          low="10" high="2000" default="600"/>

  <number id="launch" type="slider" arg="-frequency %"
          _label="Launch frequency" _low-label="Seldom" _high-label="Often"
          low="1" high="100" default="30"
          convert="invert"/>

  <number id="scatter" type="slider" arg="-scatter %"
          _label="Explosive yield" _low-label="Low" _high-label="High"
          low="1" high="400" default="100"/>

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

  <xscreensaver-updater />

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

Written by Jamie Zawinski; 1992.
  </_description>
</screensaver>