This file is indexed.

/usr/share/xscreensaver/config/mirrorblob.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.

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="mirrorblob" _label="MirrorBlob">

  <command arg="-root"/>

  <hgroup>
   <vgroup>
    <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="zoom" type="slider" arg="-zoom %"
            _label="Zoom"
            _low-label="0.1x" _high-label="3.0x"
            low="0.1" high="3.0" default="1.0"/>

    <number id="hold_time" type="slider" arg="-hold-time %"
            _label="Time until loading a new image"
            _low-label="5 sec" _high-label="5 min"
            low="5.0" high="300.0" default="30.0"/>

    <number id="fade_speed" type="slider" arg="-fade-time %"
            _label="Transition duration"
            _low-label="None" _high-label="30 sec"
            low="0.0" high="30.0" default="5.0"/>
   </vgroup>
   <vgroup>
    <number id="resolution" type="slider" arg="-resolution %"
             _low-label="Low" _high-label="High"
             _label="Resolution" low="4" high="50" default="30"/>

    <number id="bumps" type="slider" arg="-bumps %"
            _low-label="None" _high-label="50 bumps"
            _label="Bumps" low="0" high="50" default="10"/>

    <number id="blend" type="slider" arg="-blend %"
            _low-label="Clear" _high-label="Opaque"
            _label="Transparency" low="0.1" high="1.0" default="1.0"/>
   </vgroup>
  </hgroup>

   <hgroup>
   <vgroup>
  <boolean id="walls" _label="Enable walls" arg-set="-walls"/>
  <boolean id="colour" _label="Enable colouring" arg-set="-colour"/>
  <boolean id="texture" _label="Enable reflected image" arg-unset="-no-texture"/>
   </vgroup>
   <vgroup>
  <boolean id="backgound" _label="Show image on background" arg-unset="-no-paint-background"/>
  <boolean id="offset_texture" _label="Offset texture coordinates" arg-set="-offset-texture"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   </vgroup>

   <vgroup>
    <select id="render">
        <option id="wire"  _label="Wireframe" arg-set="-wire"/>
        <option id="solid" _label="Solid surface"/>
    </select>
   </vgroup>

  </hgroup>

  <_description>
Draws a wobbly blob that distorts the image behind it.
Written by Jon Dowdall; 2003.
  </_description>
</screensaver>