This file is indexed.

/usr/lib/thunderbird-addons/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/chrome/gdata-provider/content/browserRequest.xul is in xul-ext-gdata-provider 1:52.7.0+build1-0ubuntu1.

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"?>
<!--# This Source Code Form is subject to the terms of the Mozilla Public
    # License, v. 2.0. If a copy of the MPL was not distributed with this file,
    # You can obtain one at http://mozilla.org/MPL/2.0/.
 -->

<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<?xml-stylesheet href="chrome://gdata-provider/skin/browserRequest.css" type="text/css"?>

<!DOCTYPE window>
<window id="browserRequest"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
        buttons=","
        onload="loadRequestedUrl()"
        onclose="reportUserClosed()"
        title=""
        width="800"
        height="500"
        orient="vertical">

  <script type="application/javascript" src="chrome://gdata-provider/content/browserRequest.js"/>

  <keyset id="mainKeyset">
    <key id="key_close" key="w" modifiers="accel" oncommand="cancelRequest()"/>
    <key id="key_close2"  keycode="VK_ESCAPE" oncommand="cancelRequest()"/>
  </keyset>
  <vbox id="header">
    <description id="dialogMessage"/>
    <hbox id="addressbox" flex="1" disabled="true">
      <image id="security-button" src="chrome://messenger/skin/icons/mailicon32.png"/>
      <description id="headerMessage"/>
    </hbox>
  </vbox>
  <browser type="content" src="about:blank" id="requestFrame" flex="1"/>
</window>