Chris Green
--- a/src/ToolbarHandler.php
+++ b/src/ToolbarHandler.php
          '#heading' => $this->t('Environments menu'),
        ],
        '#attached' => [
-          'library' => ['environment_indicator/drupal.environment_indicator'],
+          'library' => [
+            'environment_indicator/drupal.environment_indicator',
+          ],
--- a/environment_indicator.module
+++ b/environment_indicator.module
      ],
    ],
  ];
-
+  $favicon = \Drupal::config('environment_indicator.settings')->get('favicon') ?? FALSE;
+  if ($favicon) {
+    $page_top['indicator']['#attached']['library'][] = 'environment_indicator/favicon';
+    $page_top['indicator']['#attached']['drupalSettings']['environmentIndicator']['favicon'] = $favicon;
--- a/environment_indicator.libraries.yml
+++ b/environment_indicator.libraries.yml
  js:
    js/environment_indicator.js: {}
    js/color.js: {}
-    js/tinycon.min.js: { minified: true }
  css:
    component:
      css/environment_indicator.css: {}
  dependencies:
    - core/drupal
    - core/jquery
+tinycon:
+  version: 0.6.3