Detect if an admin is logged into Shopify using liquid.

new-content-for-header.liquid

<!-- 

Simple method for detecting an Admin in Shopify using liquid.
Quick code by jason at freakdesign.com.au
Related Blog post: http://freakdesign.com.au/blogs/news/34154561

-->
{% capture CFH %}{{ content_for_header  }}{% endcapture %}{{ CFH }}

{% if CFH contains 'admin_bar_iframe' %}
  {% assign isAdmin = true %}
{% endif %}