1 files changed, 1 insertions, 1 deletions
diff --git a/browser/components/extensions/child/ext-menus.js b/browser/components/extensions/child/ext-menus.js
index 6c3b7ae492..2ffbf57132 100644
--- a/browser/components/extensions/child/ext-menus.js
+++ b/browser/components/extensions/child/ext-menus.js
@@ -248,7 +248,7 @@ this.menusInternal = class extends ExtensionAPI {
           }
           pendingMenuEvent = {
             webExtContextData,
-            observe(subject, topic, data) {
+            observe(subject) {
               pendingMenuEvent = null;
               Services.obs.removeObserver(this, "on-prepare-contextmenu");
               subject = subject.wrappedJSObject;