I'm seeing
"// TODO sg: TMP solution until we are confident in our current implementation of async imports // once we are, we can move the if into the js entry file and dynamically load the mark obsolete module"
at the bottom of each page (directly above the footer) on all question pages, I have tried multiple browsers.
Seems to be in this snippet:
<script>StackExchange.ready(function(){$.get('/posts/375317/ivc/cf81');});</script>
<noscript><div><img src="/posts/375317/ivc/cf81" class="dno" alt="" width="0" height="0"></div></noscript><div style="display:none" id="js-codeblock-lang"></div></div>
// TODO sg: TMP solution until we are confident in our current implementation of async imports
// once we are, we can move the if into the js entry file and dynamically load the mark obsolete module
</div>
</div>
<footer id="footer" class="site-footer js-footer" role="contentinfo">
Just load any question and scroll down to replicate the issue.