diff -u b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
--- b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
+++ b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
@@ -77,6 +77,8 @@
     foreach ($blocks as $block) {
       $block_selector = '#' . $block['id'];
       $this->drupalGet('user');
+      $web_assert->assertWaitOnAjaxRequest();
+
       if (isset($block['toolbar_item'])) {
         // Check that you can open a toolbar tray and it will be closed after
         // entering edit mode.
reverted:
--- b/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
+++ a/core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php
@@ -64,19 +64,6 @@
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function drupalGet($path, array $options = array(), array $headers = array()) {
-    $out = parent::drupalGet($path, $options, $headers);
-
-    // When the page has been loaded wait until jQuery is done with all Ajax
-    // activity before any further actions are done on the page.
-    $this->assertSession()->assertWaitOnAjaxRequest();
-
-    return $out;
-  }
-
-  /**
    * Asserts that the element with the given CSS selector is visible.
    *
    * @param string $css_selector