Maybe this could use the `FeedPresenter` to take advantage of the `favicon` method:

```erb
<% present feed do |feed_presenter| %>
  <button class="back-button" data-behavior="back_to_feeds">Back</button>
  <% if @feed %>
  	<%= feed_presenter.favicon %>
  	<%= @feed[:title] %>
  <% end %>
<% end %>
```