discourse-legacysite-perl/site/common/templates/include_breadcrumb.html

<div class="breadcrumb">
  <a href="/">Home</a>
  <%~loop breadcrumbs%>
  &gt; <%if url%><a href="<%url%>"><%name%></a><%else%><span><%name%></span><%endif%>
  <%~endloop%>
</div>