diff --git a/src/zen/common/ZenUIManager.mjs b/src/zen/common/ZenUIManager.mjs
index 87eefc59f..afc75175a 100644
--- a/src/zen/common/ZenUIManager.mjs
+++ b/src/zen/common/ZenUIManager.mjs
@@ -107,9 +107,12 @@ var gZenUIManager = {
 
   _initCreateNewPopup() {
     const popup = document.getElementById('zenCreateNewPopup');
-    const button = document.getElementById('zen-create-new-button');
 
     popup.addEventListener('popupshowing', () => {
+      const button = document.getElementById('zen-create-new-button');
+      if (!button) {
+        return;
+      }
       const image = button.querySelector('image');
       button.setAttribute('open', 'true');
       gZenUIManager.motion.animate(
diff --git a/src/zen/tabs/zen-tabs/vertical-tabs.css b/src/zen/tabs/zen-tabs/vertical-tabs.css
index e220ddffe..cabaec98c 100644
--- a/src/zen/tabs/zen-tabs/vertical-tabs.css
+++ b/src/zen/tabs/zen-tabs/vertical-tabs.css
@@ -238,7 +238,7 @@
   --focus-outline-color: transparent;
 
   @media (-moz-platform: macos) {
-    font-size: 1.3rem; /* Slightly larger font on macOS */
+    font-size: 1.25rem; /* Slightly larger font on macOS */
   }
 
   --tab-inner-inline-margin: 0;