This file is indexed.

/usr/share/xul-ext/greasemonkey/content/addons4.xul is in xul-ext-greasemonkey 3.8-1~deb8u1.

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-browser-overlay"
  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
>
<!-- Just injects the Firefox 4+ specific addons integration code. -->
<script type="application/x-javascript"><![CDATA[
window.addEventListener('load', function() {
var addons = {};
Components.utils.import("chrome://greasemonkey-modules/content/addons4.js", addons);
addons.GM_addonsStartup();
}, true);

// Open the scripts manager in Firefox >= 4.0
function GM_OpenScriptsMgr() {
  BrowserOpenAddonsMgr('addons://list/greasemonkey-user-script');
}

// Open the updates manager in Firefox >= 4.0
function GM_OpenUpdatesMgr() {
    BrowserOpenAddonsMgr('addons://updates/available');
}
]]></script>
</overlay>