diff --git a/popup.html b/popup.html
index 757750b4..c9d4f720 100644
--- a/popup.html
+++ b/popup.html
@@ -40,7 +40,7 @@
               <path fill-rule="evenodd" d="M0 12v3h3l8-8-3-3-8 8zm3 2H1v-2h1v1h1v1zm10.3-9.3L12 6 9 3l1.3-1.3a.996.996 0 0 1 1.41 0l1.59 1.59c.39.39.39 1.02 0 1.41z"/>
             </svg>
           </a>
-          <a href="#" class="menu-button">
+          <a href="#" class="menu-button" i18n-title="popupMenuButtonTooltip" tabindex="0">
             <svg class="svg-icon menu-button-icon" viewBox="0 0 3 16">
               <path fill-rule="evenodd" d="M0 2.5a1.5 1.5 0 1 0 3 0 1.5 1.5 0 0 0-3 0zm0 5a1.5 1.5 0 1 0 3 0 1.5 1.5 0 0 0-3 0zM1.5 14a1.5 1.5 0 1 1 0-3 1.5 1.5 0 0 1 0 3z"/>
             </svg>