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diff --git a/web/modules/contrib/environment_indicator/src/EnvironmentIndicatorListBuilder.php b/web/modules/contrib/environment_indicator/src/EnvironmentIndicatorListBuilder.php
new file mode 100644
index 000000000..0e193a823
--- /dev/null
+++ b/web/modules/contrib/environment_indicator/src/EnvironmentIndicatorListBuilder.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\environment_indicator;
+
+use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides a listing of environments.
+ */
+class EnvironmentIndicatorListBuilder extends ConfigEntityListBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'environment_indicator_overview_environments';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $row['name'] = $this->t('Environment name');
+    $row['url'] = $this->t('Environment url');
+    $row += parent::buildHeader();
+    return $row;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    /* @var \Drupal\environment_indicator\Entity\EnvironmentIndicator $entity */
+    $row = [
+      'style' => 'color: ' . $entity->getFgColor() . '; background-color: ' . $entity->getBgColor() . ';',
+    ];
+
+    $row['data']['name'] = [
+      'data' => $entity->label(),
+    ];
+    $row['data']['url'] = [
+      'data' => $entity->getUrl(),
+    ];
+
+    $row['data'] += parent::buildRow($entity);
+    return $row;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function render() {
+    $build['action_header']['#markup'] = '<h3>' . t('Available actions:') . '</h3>';
+    $entities = $this->load();
+    // If there are not multiple vocabularies, disable dragging by unsetting the
+    // weight key.
+    if (count($entities) <= 1) {
+      unset($this->weightKey);
+    }
+    $build = parent::render();
+    $build['table']['#empty'] = $this->t('No environment switchers available. <a href=":link">Add environment</a>.', [':link' => \Drupal::url('entity.environment_indicator.add')]);
+    return $build;
+  }
+
+}