pubmed.mustache in onebox-1.9.27.2

- old
+ new

@@ -1,6 +1,6 @@
 <h4>
-  <a href="{{link}}" target="_blank">{{title}}</a>
+  <a href="{{link}}" target="_blank" rel="noopener">{{title}}</a>
 </h4>
 
 <div class="date">
   {{authors}},
   <i>{{journal}}</i>, {{date}}