This file is indexed.

/usr/share/lyx/layouts/customHeadersFooters.module is in lyx-common 2.2.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#\DeclareLyXModule[fancyhdr.sty]{Custom Header/Footerlines}
#DescriptionBegin
#Adds environments to define header and footer lines.
#NOTE: To use this module you must set the 'Headings style' in 
#      the menu Document Settings -> Page Layout to 'fancy'!
#DescriptionEnd
#Author: Uwe Stöhr

Format 60

Style "Left Header"
  Category		Header/Footer
  Margin		First_Dynamic
  LatexType		command
  LabelType		Static
  LabelSep		xx
  LatexName	        lhead
  LabelString		"Left Header:"
  Argument 1
    LabelString		"Even Header"
    Tooltip		"Alternative text for the even header"
  EndArgument
  KeepEmpty		1
  ParSkip		0
  TopSep		0
  BottomSep		0
  ParSep		0
  LabelFont
    Color		Green
  EndFont
End

Style "Center Header"
  CopyStyle		"Left Header"
  LatexName	        chead
  LabelString		"Center Header:"
End

Style "Right Header"
  CopyStyle		"Left Header"
  LatexName	        rhead
  LabelString		"Right Header:"
End

Style "Left Footer"
  CopyStyle		"Left Header"
  LatexName	        lfoot
  LabelString		"Left Footer:"
End

Style "Center Footer"
  CopyStyle		"Left Header"
  LatexName	        cfoot
  LabelString		"Center Footer:"
End

Style "Right Footer"
  CopyStyle		"Left Header"
  LatexName	        rfoot
  LabelString		"Right Footer:"
End