--- a/pylib/mozreview/mozreview/extension.py
+++ b/pylib/mozreview/mozreview/extension.py
@@ -193,16 +193,17 @@ class MozReviewExtension(Extension):
         set_diff_opcode_generator_class(NoFilterDiffOpcodeGenerator)
 
         initialize_pulse_handlers(self)
 
         URLHook(self,
                 patterns('', url(r'^mozreview/', include('mozreview.urls'))))
 
         HeaderDropdownActionHook(self, actions=[{
+            'id': 'nav-mozreview-menu',
             'label': 'MozReview',
             'items': [
                 {
                     'label': 'User Guide',
                     'url': 'https://mozilla-version-control-tools.readthedocs.io/en/latest/mozreview-user.html',
                 },
                 {
                     'label': 'Mercurial for Mozillians',

--- a/pylib/mozreview/mozreview/static/mozreview/js/default.js
+++ b/pylib/mozreview/mozreview/static/mozreview/js/default.js
@@ -3,9 +3,12 @@
   $('#navbar a[href="/r/new/"]').parent('li').remove();
 
   // Fix logout url
   $("a[href='/account/logout/']").attr("href", "/mozreview/logout/");
   $("#accountnav li").css("visibility", "visible");
 
   // Hide "Close Discarded" and "Close Submitted" in request listings
   $('#page_sidebar').find('a.discard, a.submit').remove();
+
+  // Open MozReview subnav items in a new window
+  $('#nav-mozreview-menu').parent().find('li a').attr('target', '_blank');
 });