diff --git a/core/modules/media/tests/src/FunctionalJavascript/MediaSourceTestBase.php b/core/modules/media/tests/src/FunctionalJavascript/MediaSourceTestBase.php
index 24cd134..9aa4848 100644
--- a/core/modules/media/tests/src/FunctionalJavascript/MediaSourceTestBase.php
+++ b/core/modules/media/tests/src/FunctionalJavascript/MediaSourceTestBase.php
@@ -121,7 +121,6 @@ public function doTestCreateMediaType($media_type_id, $source_id, array $provide
 
     // Save the form to create the type.
     $page->pressButton('Save');
-    $assert_session->statusCodeEquals(200);
     $assert_session->pageTextContains('The media type ' . $media_type_id . ' has been added.');
     $this->drupalGet('admin/structure/media');
     $assert_session->pageTextContains($media_type_id);
diff --git a/core/modules/media/tests/src/FunctionalJavascript/MediaUiJavascriptTest.php b/core/modules/media/tests/src/FunctionalJavascript/MediaUiJavascriptTest.php
index b150f89..ec8833c 100644
--- a/core/modules/media/tests/src/FunctionalJavascript/MediaUiJavascriptTest.php
+++ b/core/modules/media/tests/src/FunctionalJavascript/MediaUiJavascriptTest.php
@@ -54,7 +54,6 @@ public function testMediaTypes() {
     $assert_session = $this->assertSession();
 
     $this->drupalGet('admin/structure/media');
-    $assert_session->statusCodeEquals(200);
     $assert_session->pageTextContains('No media types available. Add media type.');
     $assert_session->linkExists('Add media type');
 
@@ -69,10 +68,8 @@ public function testMediaTypes() {
     $this->assertJsCondition("jQuery('.form-item-source-configuration-test-config-value').length > 0;");
     $page->fillField('description', $description);
     $page->pressButton('Save');
-    $assert_session->statusCodeEquals(200);
     $assert_session->pageTextContains('The media type ' . $name . ' has been added.');
     $this->drupalGet('admin/structure/media');
-    $assert_session->statusCodeEquals(200);
     $assert_session->pageTextContains($name);
     $assert_session->pageTextContains($description);
 
@@ -141,7 +138,7 @@ public function testMediaTypes() {
     $page->uncheckField('options[status]');
     $page->checkField('options[queue_thumbnail_downloads]');
     $page->pressButton('Save');
-    $assert_session->statusCodeEquals(200);
+    $assert_session->pageTextContains("The media type $new_name has been updated.");
 
     // Test if edit worked and if new field values have been saved as expected.
     $this->drupalGet('admin/structure/media/manage/' . $this->testMediaType->id());
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
index e02e0df..fa2d541 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
@@ -48,13 +48,10 @@ public function testSessionExpiration() {
     // number of times.
     $this->drupalGet('<front>');
 
-    $session_assert = $this->assertSession();
-
     $page = $this->getSession()->getPage();
 
     for ($i = 0; $i < 25; $i++) {
       $page->clickLink('Link to front page');
-      $session_assert->statusCodeEquals(200);
     }
   }
 
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
index 81d379f..d571a1b 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
@@ -366,4 +366,60 @@ function t(r, lx, ly) {
     return $this->session->evaluateScript($full_javascript_visibility_test);
   }
 
+  /**
+   * The use of statusCodeEquals() is not available.
+   *
+   * @param int $code
+   *   The status code.
+   *
+   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
+   *   Throws an exception on use.
+   */
+  public function statusCodeEquals($code) {
+    throw new UnsupportedDriverActionException('The use of statusCodeEquals() is not available in a functional JavaScript test.', $this->session->getDriver());
+  }
+
+  /**
+   * The use of statusCodeNotEquals() is not available.
+   *
+   * @param int $code
+   *   The status code.
+   *
+   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
+   *   Throws an exception on use.
+   */
+  public function statusCodeNotEquals($code) {
+    throw new UnsupportedDriverActionException('The use of statusCodeNotEquals() is not available in a functional JavaScript test.', $this->session->getDriver());
+  }
+
+  /**
+   * The use of responseHeaderEquals() is not available.
+   *
+   * @param string $name
+   *   The name of the header.
+   * @param string $value
+   *   The value to check the header against.
+   *
+   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
+   *   Throws an exception on use.
+   */
+  public function responseHeaderEquals($name, $value) {
+    throw new UnsupportedDriverActionException('The use of responseHeaderEquals() is not available in a functional JavaScript test.', $this->session->getDriver());
+  }
+
+  /**
+   * The use of responseHeaderNotEquals() is not available.
+   *
+   * @param string $name
+   *   The name of the header.
+   * @param string $value
+   *   The value to check the header against.
+   *
+   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
+   *   Throws an exception on use.
+   */
+  public function responseHeaderNotEquals($name, $value) {
+    throw new UnsupportedDriverActionException('The use of responseHeaderNotEquals() is not available in a functional JavaScript test.', $this->session->getDriver());
+  }
+
 }
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index bd50c23..8ad783a 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -736,7 +736,6 @@ protected function drupalLogin(AccountInterface $account) {
     }
 
     $this->drupalGet('user/login');
-    $this->assertSession()->statusCodeEquals(200);
     $this->submitForm([
       'name' => $account->getUsername(),
       'pass' => $account->passRaw,
@@ -761,7 +760,6 @@ protected function drupalLogout() {
     // screen.
     $assert_session = $this->assertSession();
     $this->drupalGet('user/logout', ['query' => ['destination' => 'user']]);
-    $assert_session->statusCodeEquals(200);
     $assert_session->fieldExists('name');
     $assert_session->fieldExists('pass');