app/views/layouts/_user_header.html.erb
<% cache_unless user_signed_in?, ['user_header', tor_s] do %>
<div id='signin' class='header'>
<% if user_signed_in? %>
Welcome back, <%= current_user.name %>!
<%= link_to 'Edit profile', edit_user_registration_path %>
<%= link_to 'Log out', logout_path, :method => :delete %>?<br/>
<% else %>
Would you like to <%= link_to 'log in or sign up', login_path %>?
<% end %>
<% if tor? %>
<%= image_tag "tor-on_16.png", alt: "Tor!", width: 16, height: 16 %>
<% end %>
</div>
<% end %>