--- a/toolkit/components/extensions/test/mochitest/test_ext_extension.html
+++ b/toolkit/components/extensions/test/mochitest/test_ext_extension.html
@@ -13,17 +13,17 @@
 <script type="text/javascript">
 "use strict";
 
 add_task(function* test_is_allowed_incognito_access() {
   function backgroundScript() {
     browser.extension.isAllowedIncognitoAccess().then(isAllowedIncognitoAccess => {
       browser.test.assertEq(true, isAllowedIncognitoAccess, "isAllowedIncognitoAccess is true");
       browser.test.notifyPass("isAllowedIncognitoAccess");
-    })
+    });
   }
 
   let extension = ExtensionTestUtils.loadExtension({
     background: `(${backgroundScript})()`,
     manifest: {}
   });
 
   yield extension.startup();