diff --git a/ext/bg/js/settings/popup-preview-frame.js b/ext/bg/js/settings/popup-preview-frame.js
index a26d3148..b2902af0 100644
--- a/ext/bg/js/settings/popup-preview-frame.js
+++ b/ext/bg/js/settings/popup-preview-frame.js
@@ -53,7 +53,7 @@ class SettingsPopupPreview {
         this.frontend.setEnabled = function () {};
         this.frontend.searchClear = function () {};
 
-        this.frontend.popup.childrenSupported = false;
+        this.frontend.popup.setChildrenSupported(false);
 
         await this.frontend.isPrepared();
 
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 2af734a9..552bdcf6 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -135,6 +135,10 @@ class Popup {
         }
     }
 
+    setChildrenSupported(value) {
+        this.childrenSupported = value;
+    }
+
     getContainer() {
         return this.container;
     }