Add rel="noopener noreferrer".
{% block footer-content %}
- <a href="https://github.com/rtfd/readthedocs.org">GitHub</a> | <a href="http://docs.readthedocs.io">{% trans "Docs" %}</a>.
+ <a href="https://github.com/rtfd/readthedocs.org" rel="noopener noreferrer">GitHub</a> | <a href="http://docs.readthedocs.io">{% trans "Docs" %}</a>.
{% url "gold_detail" as gold_detail %}
{% blocktrans %}
