diff -u b/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php b/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarAdminMenuTest.php
--- b/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarAdminMenuTest.php
@@ -1,12 +1,12 @@
 <?php
 
-namespace Drupal\Tests\toolbar\Functional;
+namespace Drupal\Tests\toolbar\FunctionalJavascript;
 
 use Drupal\Core\EventSubscriber\MainContentViewSubscriber;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Url;
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
 use Drupal\language\Entity\ConfigurableLanguage;
-use Drupal\Tests\BrowserTestBase;
 use Drupal\user\RoleInterface;
 
 /**
@@ -26,7 +26,7 @@
  *
  * @group toolbar
  */
-class ToolbarAdminMenuTest extends BrowserTestBase {
+class ToolbarAdminMenuTest extends JavascriptTestBase {
 
   /**
    * A user with permission to access the administrative toolbar.