Meta Maid is the simplest of plugins, allowing you to add meta tags, script tags and tracking code to
Plugin Tag: header code
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GTM Code Visibility
Easily add Google Tag Manager code to your site and use it only when site is switched to "Search Engine Visibility".
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Embed Code – Headers & Footers by DesignBombs
The easiest way to embed code in the head or footer of your site, globally or on a per-page/post basis.