This file is indexed.

/usr/lib/xul-ext/webaccounts/content/browser.xul is in xul-ext-webaccounts 0.5-0ubuntu2.

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"?>

<overlay id="unity_overlay"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
  <window id="main-window">
    <script type="application/x-javascript" src="resource://webaccounts/browser.js" />
  </window>
</overlay>