1 files changed, 1 insertions, 1 deletions
diff --git a/toolkit/components/extensions/child/ext-userScripts-content.js b/toolkit/components/extensions/child/ext-userScripts-content.js
index ee1a1b7a8f..d2edb3c515 100644
--- a/toolkit/components/extensions/child/ext-userScripts-content.js
+++ b/toolkit/components/extensions/child/ext-userScripts-content.js
@@ -375,7 +375,7 @@ this.userScriptsContent = class extends ExtensionAPI {
               throw new ExtensionError(USERSCRIPT_DISABLED_ERRORMSG);
             }
 
-            let handler = (event, metadata, scriptSandbox, eventResult) => {
+            let handler = (event, metadata, scriptSandbox) => {
               const us = new UserScript({
                 context,
                 metadata,