Go back to last collection viewed.js

//Add to theme.liquid file before </body> tag
   <script>
      if(Storage !== undefined) {

        var defaultLink = "/collections/all";

        {% if template contains 'collection' %}
        sessionStorage.collection = "{{ collection.url }}";
        {% endif %}

        {% if template contains 'cart' %}
        if( !sessionStorage.collection ) {
          sessionStorage.collection = defaultLink;
        }
        $(".continue-shopping").attr('href',sessionStorage.collection);
        {% endif %}

      }
    </script>

//menu-cart.liquid
<a href="javascript:void(0)" class="info_btn continue-shopping"><span class="fa fa-chevron-left"></span>{{ 'cart.general.continue_browsing' | t }}</a>