1 files changed, 2 insertions, 2 deletions
diff --git a/toolkit/content/widgets/dialog.js b/toolkit/content/widgets/dialog.js
index 52eb2168f8..c4b25c2f48 100644
--- a/toolkit/content/widgets/dialog.js
+++ b/toolkit/content/widgets/dialog.js
@@ -146,7 +146,7 @@
       if (document.readyState == "complete") {
         this._postLoadInit();
       } else {
-        window.addEventListener("load", event => this._postLoadInit());
+        window.addEventListener("load", () => this._postLoadInit());
       }
     }
 
@@ -521,7 +521,7 @@
       }
 
       var btn = this.getButton(this.defaultButton);
-      if (btn) {
+      if (btn && !btn.hidden) {
         this._doButtonCommand(this.defaultButton);
       }
     }