{% extends "base.html" %}
{% block body %}
  <ul class="extensions">
  {% if extension_list %}
  {% load paginator %}
  {% if page_obj.has_other_pages %}
  <div class="paginator">
    {% paginator page_obj %}
  </div>
  {% endif %}

  {% for extension in extension_list %}
  {% with extension.latest_version as version %}
    <li class="extension">
      <h3 class="extension-name"><a href="{% url extensions-detail pk=extension.pk %}" class="title-link"><img src="{{ extension.icon.url }}" class="icon">{{ extension.name }}</a></h3>
      <span class="author">by <a href="{% url auth-profile user=extension.creator.username %}">{{ extension.creator }}</a></span>
      <p class="description">
        {{ extension.description }}
      </p>
    </li>
  {% endwith %}
  {% endfor %}
  {% else %}
    <div class="empty">
      There are no extensions.
    </div>
  {% endif %}
  </ul>

  {% if page_obj.has_other_pages %}
  <div class="paginator">
    {% paginator page_obj %}
  </div>
  {% endif %}
{% endblock %}

{% block navclass %}main{% endblock %}

{% extends "base.html" %}
{% block body %}
  <ul class="extensions">
  {% if extension_list %}
  {% load paginator %}
  {% if page_obj.has_other_pages %}
  <div class="paginator">
    {% paginator page_obj %}
  </div>
  {% endif %}

  {% for extension in extension_list %}
    <li class="extension">
      <h3 class="extension-name"><a href="{% url extensions-detail pk=extension.pk %}" class="title-link"><img src="{{ extension.icon.url }}" class="icon">{{ extension.name }}</a></h3>
      <span class="author">by <a href="{% url auth-profile user=extension.creator.username %}">{{ extension.creator }}</a></span>
      <p class="description">
        {{ extension.description }}
      </p>
    </li>
  {% endfor %}
  {% else %}
    <div class="empty">
      There are no extensions.
    </div>
  {% endif %}
  </ul>

  {% if page_obj.has_other_pages %}
  <div class="paginator">
    {% paginator page_obj %}
  </div>
  {% endif %}
{% endblock %}

{% block navclass %}main{% endblock %}

Remove an unused with block in templates
Remove an unused with block in templates

We don't depend on anything version-specific in the list
