diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 5a0166bf..bbf39c4e 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -22,8 +22,9 @@
  * dynamicLoader
  */
 
-class Popup {
+class Popup extends EventDispatcher {
     constructor(id, depth, frameId, ownerFrameId) {
+        super();
         this._id = id;
         this._depth = depth;
         this._frameId = frameId;