diff --git a/admin/class-h5p-editor-wordpress-storage.php b/admin/class-h5p-editor-wordpress-storage.php
index 177fdcdd..9ee72de5 100644
--- a/admin/class-h5p-editor-wordpress-storage.php
+++ b/admin/class-h5p-editor-wordpress-storage.php
@@ -178,7 +178,8 @@ public function getLibraries($libraries = NULL) {
    */
   public function alterLibraryFiles(&$files, $libraries) {
     $plugin = H5P_Plugin::get_instance();
-    $plugin->alter_assets($files, $libraries, 'editor');
+    $custom_script_parameters = (object) array();
+    $plugin->alter_assets($files, $libraries, 'editor', $custom_script_parameters);
   }
 
   /**
diff --git a/admin/class-h5p-plugin-admin.php b/admin/class-h5p-plugin-admin.php
index f6eb1d5a..d4722785 100644
--- a/admin/class-h5p-plugin-admin.php
+++ b/admin/class-h5p-plugin-admin.php
@@ -228,7 +228,11 @@ public function embed() {
           // Get content assets
           $preloaded_dependencies = $core->loadContentDependencies($content['id'], 'preloaded');
           $files = $core->getDependenciesFiles($preloaded_dependencies);
-          $plugin->alter_assets($files, $preloaded_dependencies, 'external');
+          $custom_script_parameters = (object) array();
+          $plugin->alter_assets($files, $preloaded_dependencies, 'external', $custom_script_parameters);
+          if (is_object($custom_script_parameters) && !empty((array) $custom_script_parameters)) {
+            $integration['customScriptParameters'] = $custom_script_parameters;
+          }
 
           $scripts = array_merge($scripts, $core->getAssetsUrls($files['scripts']));
           $styles = array_merge($styles, $core->getAssetsUrls($files['styles']));
diff --git a/public/class-h5p-plugin.php b/public/class-h5p-plugin.php
index 7d06e075..dd533e74 100644
--- a/public/class-h5p-plugin.php
+++ b/public/class-h5p-plugin.php
@@ -1117,7 +1117,16 @@ public function add_assets($content, $no_cache = FALSE) {
       // Get assets for this content
       $preloaded_dependencies = $core->loadContentDependencies($content['id'], 'preloaded');
       $files = $core->getDependenciesFiles($preloaded_dependencies);
-      $this->alter_assets($files, $preloaded_dependencies, $embed);
+
+      // Optional script parameters that custom user scripts should be able to access
+      $custom_script_parameters = (object) array();
+
+      $this->alter_assets($files, $preloaded_dependencies, $embed, $custom_script_parameters);
+
+      if ((is_object($custom_script_parameters)) && !empty((array)$custom_script_parameters)) {
+        // Allow to access custom user script paramters via H5PIntegration
+        self::$settings['customScriptParameters'] = $custom_script_parameters;
+      }
 
       /*
        * Cached assets were broken by faulty folder structure in 1.17.0 - 1.17.3
@@ -1170,8 +1179,9 @@ public function add_assets($content, $no_cache = FALSE) {
    * @param array $dependencies
    * @param array $files scripts & styles
    * @param string $embed type
+   * @param object &$custom_script_parameters Custom parameters that should be available to JavaScript
    */
-  public function alter_assets(&$files, &$dependencies, $embed) {
+  public function alter_assets(&$files, &$dependencies, $embed, &$custom_script_parameters = null) {
     if (!has_action('h5p_alter_library_scripts') && !has_action('h5p_alter_library_styles')) {
       return;
     }
@@ -1194,8 +1204,9 @@ public function alter_assets(&$files, &$dependencies, $embed) {
      * @param array &$scripts List of JavaScripts to be included.
      * @param array $libraries The list of libraries that has the scripts.
      * @param string $embed_type Possible values are: div, iframe, external, editor.
+     * @param object &$custom_script_parameters Custom parameters that should be available to JavaScript
      */
-    do_action_ref_array('h5p_alter_library_scripts', array(&$files['scripts'], $libraries, $embed));
+    do_action_ref_array('h5p_alter_library_scripts', array(&$files['scripts'], $libraries, $embed, &$custom_script_parameters));
 
     /**
      * Allows you to alter which stylesheets are loaded for H5P. This is