This file is indexed.

/usr/share/xul-ext/greasemonkey/content/closewindow.xul is in xul-ext-greasemonkey 1.15-1~deb7u1.

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="greasemonkey-close-window-overlay"
  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<commandset>
  <command id="cmd_close"
      oncommand="if ('undefined' != typeof GM_onClose) GM_onClose(); window.close();"
      />
</commandset>

<keyset>
  <key command="cmd_close" key="w" modifiers="accel" />
  <key command="cmd_close" keycode="VK_ESCAPE" />
</keyset>

</overlay>