Frankie Jarrett

<p><strong>Did you find this plugin helpful? Please consider <a href="https://wordpress.org/support/view/plugin-reviews/zing" rel="ugc">leaving a 5-star review</a>.</strong></p>
<p>This plugin is perfect for:</p>
<ul>
<li>Playing an <a href="http://en.wikipedia.org/wiki/April_Fools%27_Day" rel="nofollow ugc">April Fools’ Day</a> joke</li>
<li>Pissing off your colleagues</li>
<li>Freaking out your boss</li>
<li>Increasing hacker bounce rate</li>
</ul>
<p>Press the <code>z</code> key to toggle <em>Zing!</em> on and off.</p>
<p><strong>Development of this plugin is done <a href="https://github.com/fjarrett/zing" rel="nofollow ugc">on GitHub</a>. Pull requests welcome. Please see <a href="https://github.com/fjarrett/zing/issues" rel="nofollow ugc">issues reported</a> there before going to the plugin forum.</strong></p>


Zing!

Turn your admin panel upside down. Literally.

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.

Zing! vs Header and Footer Scripts