Chris J. Zähller

<p>In its default settings, Contact Form 7 loads its JavaScript and CSS stylesheet on every page. This slows page loading and taxes server and client resources. Use this plugin to control which pages the scripts load on.</p>
<p>NEW in v1.0.15: The plugin also prevents scripts and styles from the following plugins from loading. If you are using any other plugin that extends Contact Form 7 and loads its scripts on all pages, please open a support ticket and we will look into adding it.</p>
<ul>
<li>Contact Form 7 Conditional Fields</li>
<li>Contact Form 7 Multi-Step Forms</li>
<li>Contact Form CFDB7</li>
<li>Drag and Drop Multiple File Upload — Contact Form 7</li>
</ul>
<h3>Translations</h3>
<ul>
<li>English: Default language, always included</li>
</ul>
<p>Would you like to help translate Conditionally Load CF7 into your own language? <a href="https://translate.wordpress.org/projects/wp-plugins/cf7-conditional-load" rel="nofollow ugc">You can do that here!</a></p>


Conditionally Load CF7

Load Contact Form 7 & select CF7-related plugin scripts & styles only where needed.

Anand Kumar

Digital Liberation

<p>If you are running a WordPress site then sooner or later you need to insert some kind of code to your website. It is most likley a web analytics code like Google Analytics or may be social media script or some CSS stylesheet or may be Custom fonts. This plugin will do all the magic. Even if you want to insert those codes in a custom post type.</p>
<p>All you have to do is adding 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>To insert CSS and JavaScript codes to <code><head></code> or before <code></body></code>.</li>
<li>To insert code to <code><head></code> of any single page or post.</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 theme do 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 furhter 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.

Conditionally Load CF7 vs Header and Footer Scripts