1 files changed, 3 insertions, 0 deletions
diff --git a/index.html b/index.html
index 74ba23e..00b9a94 100644
--- a/index.html
+++ b/index.html
@@ -65,6 +65,9 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
     <!-- Performance tip: hint to the browser to start the handshake for the fonts site -->
     <link rel="preconnect" href="https://fonts.gstatic.com/" crossorigin>
+
+    <script src="https://www.gstatic.com/firebasejs/5.3.0/firebase.js"></script>
+
     <script>
       // Load and register pre-caching Service Worker
       if ('serviceWorker' in navigator) {