--- a/reviewboard/reviewboard/templates/diffviewer/diff_file_fragment_mozreview.html
+++ b/reviewboard/reviewboard/templates/diffviewer/diff_file_fragment_mozreview.html
@@ -45,18 +45,20 @@
 
 {% if not standalone %}
 <table id="file{{file.filediff.id}}" class="{% spaceless %}
   sidebyside
   {% if file.is_new_file %}newfile{% endif %}
   {% if file.binary %}diff-binary{% endif %}
   {% if file.deleted %}diff-deleted{% endif %}
   {% endspaceless %}"
-      data-lines-equal="{{equal_lines}}"
-  data-extra_data="{{ file.filediff.extra_data }}">
+  data-lines-equal="{{equal_lines}}"
+  {% for k, v in file.filediff.extra_data.items %}
+	data-{{ k }}="{{ v }}"
+  {% endfor %}>
  <colgroup>
 {%  if not file.is_new_file %}
   <col class="line" />
   <col class="left" />
 {%  endif %}
   <col class="line" />
   <col class="right" />
  </colgroup>