This file is indexed.

/usr/share/xscreensaver/config/bubble3d.xml is in xscreensaver-gl 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="bubble3d" _label="Bubble3D" gl="yes">

  <command arg="-root"/>

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

  <boolean id="transp" _label="Transparent bubbles" arg-unset="-no-transparent"/>
  <string id="color"    _label="Bubble color"      arg="-color %"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  <xscreensaver-updater />

  <_description>
Rising, undulating 3D bubbles, with transparency and specular reflections. 

Written by Richard Jones; 1998.
  </_description>
</screensaver>