Jesper van Engelen

The Sidebars & Widgets extension for the Debug Bar shows you all you need to know about the sidebars and widgets on the current page. It shows the sidebars displayed and the widgets displayed in them, and tells you whether all widgets in the sidebar were actually displayed.
This plugin allows you to analyze the behaviour of your WordPress sidebars and wigets, and is aimed at WordPress developers.
<blockquote>
This plugin is an extension to the <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar plugin</a>, which is required for this plugin to work.
</blockquote>
This plugin integrates nicely with <a href="https://wordpress.org/plugins/content-aware-sidebars/" rel="ugc">Content Aware Sidebars</a>, telling you what sidebars were replaced and merged. It is an essential plugin if you use Content Aware Sidebars with a big number of sidebars.

Debug Bar – Sidebars & Widgets

Debug Bar extension that adds information about the sidebars and widgets on the current page. Integrates with Content Aware Sidebars plugin.

10up

Taylor Lovett

Allows you to examine every ElasticPress query running on any given request by adding an <a href="https://wordpress.org/plugins/elasticpress" rel="ugc">ElasticPress</a> panel to <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar</a> and/or <a href="https://wordpress.org/plugins/query-monitor/" rel="ugc">Query Monitor</a> plugins.
Alternatively, go to ElasticPress > Query Log and set it to record ElasticPress queries.
<h4>Requirements:</h4>
<ul>
<li><a href="https://wordpress.org/plugins/elasticpress" rel="ugc">ElasticPress 4.4.0+</a></li>
<li><a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar 1.0+</a></li>
<li>PHP 7.0+</li>
</ul>

ElasticPress Debugging Add-On

Indispensable if you're working on a site with ElasticPress integration

This plugin works perfectly and is very useful for debugging ElasticPress queries.

It Does What It Says

Extends the Query Monitor and Debug Bar plugins for ElasticPress queries.

Debug Bar – Sidebars & Widgets vs ElasticPress Debugging Add-On