John Dalesandro

<p><strong>Head Trimmer</strong> gives you granular control over what WordPress automatically outputs in the HEAD element of every page. Each option is independent; enable only the removals that make sense for your site.</p>
<p>Removing unnecessary HEAD elements reduces page weight, eliminates potential security signatures such as the WordPress version number, and keeps your generated source code clean.</p>
<p>All settings are opt-in. Nothing is removed until you enable it on the Admin <span aria-hidden="true" class="wp-exclude-emoji">→</span> Settings <span aria-hidden="true" class="wp-exclude-emoji">→</span> Head Trimmer screen.</p>
<p>Removal options include:</p>
<ul>
<li>WordPress Version (generator meta tag)</li>
<li>WordPress Version from Script and Style URLs</li>
<li>All Other Version Signatures from Script and Style URLs</li>
<li>Shortlink</li>
<li>Shortlink from HTTP Response Headers</li>
<li>Canonical</li>
<li>Relational Links for Posts Adjacent to Current Post</li>
<li>RSS Feeds (removes head links and disables feed endpoints)</li>
<li>Really Simple Discovery Link for xmlrpc (rsd_link)</li>
<li>Windows Live Writer Manifest File Link (wlwmanifest_link)</li>
<li>oEmbed Discovery Links</li>
<li>REST API Link and REST API Link Header</li>
<li>Emoji Support</li>
<li>Global Styles and SVG Filters (duotone filters)</li>
<li>Gutenberg Block CSS Styles (or optionally set ‘should_load_separate_core_block_assets’ to load block styles only when needed)</li>
<li>Classic Theme CSS Styles (classic-theme-styles)</li>
<li>DNS Prefetch for //s.w.org</li>
<li>DNS Prefetch for Google Fonts //fonts.googleapis.com</li>
<li>jQuery</li>
<li>JavaScript Import Map (added in WordPress 6.5)</li>
<li>Interactivity API (added in WordPress 6.5)</li>
<li>Image Auto Sizes Styles (added in WordPress 6.7)</li>
<li>Speculation Rules (added in WordPress 6.8)</li>
<li>Comment Reply Script (loads only on singular posts and pages where comments are open)</li>
</ul>


Head Trimmer

Selectively remove WordPress version information, feeds, shortlinks, emoji support, scripts, styles, and other automatically generated extras from the …

Anand Kumar

jamify

Digital Liberation

<p>An essential WordPress plugin to easily insert scripts and styles (like Google Analytics, CSS, etc.) into your website’s header and footer.</p>
<p>Looking for a way to add Google Analytics, Facebook Pixel, or custom tracking code to your website’s header or footer?</p>
<p>Header and Footer Scripts is a simple yet powerful plugin that lets you inject code—such as Google Analytics, custom CSS, Facebook Pixel, and chat widgets—directly into your site’s header (<code><head></code>) or footer.</p>
<p>No bloat, no ads. This lightweight plugin simply does what it says: inserts code into your header and footer efficiently.</p>
<p>All you have to do is add the appropriate HTML code.</p>
<p>Don’t forget to wrap your code with proper tags.</p>
<pre><code><script type="text/javascript">
YOUR JS CODE HERE
</script>
</code></pre>
<p>Or for CSS:</p>
<pre><code><style type="text/css">
YOUR CSS CODE HERE
</style>
</code></pre>
<h4>Why use this plugin:</h4>
<ul>
<li>Insert scripts globally into the header and footer of your entire website.</li>
<li>Supports all script types including HTML, JavaScript, and CSS.</li>
<li>Add specific scripts to the header of individual posts or pages.</li>
<li>To insert code to Custom Post Type [New Feature].</li>
</ul>
<p>The plugin should be compatible with WooCommerce.</p>
<h4>What it does not offer</h4>
<ul>
<li>You can’t insert/execute PHP codes.</li>
</ul>
<p>Almost all WordPress themes support this “Header and Footer Scripts” plugin. If the codes are not appearing in your site [ask for support] or look at your theme file if they have standard <code>wp_head</code> and <code>wp_footer</code> hooks.</p>
<h4>Important Links</h4>
<p>For further information you are welcomed to follow these links:</p>
<ul>
<li><strong><a href="https://github.com/anandkumar/header-and-footer-scripts/wiki" rel="nofollow ugc">Read Documentation</a></strong></li>
<li><strong><a href="https://wordpress.org/support/plugin/header-and-footer-scripts/" rel="ugc">Get Support</a></strong></li>
<li><strong><a href="https://github.com/anandkumar/header-and-footer-scripts" rel="nofollow ugc">GitHub Repository</a></strong></li>
</ul>


Header and Footer Scripts

good

Como es posible que al desinstalar el plugin, si no has borrado el script te deje el código ahi metido. Y luego a averiguar de donde vienen los errores. 

Al desinstalar te deja el código

Header and Footer Scripts plugin allows you to add scripts to WordPress site's  and just before closing  tag.

Head Trimmer vs Header and Footer Scripts