I changed the widget to the following code with no effect:
<noinclude>__NOTOC__
This widget allows you to embed '''[http://www.disqus.com/ DISQUS Comments]''' on your wiki page.
Created by [http://www.mediawikiwidgets.org/User:Sergey_Chernyshev Sergey Chernyshev]
== Using this widget ==
For information on how to use this widget, see [http://www.mediawikiwidgets.org/DISQUS widget description page on MediaWikiWidgets.org].
== Copy to your site ==
To use this widget on your site, just install [https://www.mediawiki.org/wiki/Extension:Widgets MediaWiki Widgets extension] and copy [{{fullurl:{{FULLPAGENAME}}|action=edit}} full source code] of this page to your wiki as '''{{FULLPAGENAME}}''' article.
</noinclude><includeonly><div id="disqus_thread"></div>
<script type="text/javascript">
/* * * CONFIGURATION VARIABLES * * */
var disqus_shortname = '<!--{$id|escape:'urlpathinfo '}-->'; // required: replace example with your forum shortname
<!--{if (isset($uniqid))}-->var disqus_identifier = '<!--{$uniqid|escape:'quotes'}-->';<!--{/if}-->
<!--{if (isset($url))}-->var disqus_url = '<!--{$url|escape:'quotes'}-->';<!--{/if}-->
/* * * DON'T EDIT BELOW THIS LINE * * */
(function() {
var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript" rel="nofollow">comments powered by Disqus.</a></noscript>