diff --git a/phpBB/phpbb/extension/manager.php b/phpBB/phpbb/extension/manager.php
index 036a0fc07d..608fd12444 100644
--- a/phpBB/phpbb/extension/manager.php
+++ b/phpBB/phpbb/extension/manager.php
@@ -510,29 +510,15 @@ class manager
 	*/
 	public function is_available($name)
 	{
-		// Not available if the folder does not exist
-		if (!file_exists($this->get_extension_path($name, true)))
+		$md_manager = $this->create_extension_metadata_manager($name, $this->container->get('template'));
+		try
+		{
+			return $md_manager->get_metadata('all') && $md_manager->validate_enable();
+		}
+		catch (\phpbb\extension\exception $e)
 		{
 			return false;
 		}
-
-		$composer_file = $this->get_extension_path($name, true) . 'composer.json';
-
-		// Not available if there is no composer.json.
-		if (!is_readable($composer_file) || !($ext_info = file_get_contents($composer_file)))
-		{
-			return false;
-		}
-		$ext_info = json_decode($ext_info, true);
-
-		// Not available if malformed name or if the directory structure
-		// does not match the name value specified in composer.json.
-		if (substr_count($name, '/') !== 1 || !isset($ext_info['name']) || $name != $ext_info['name'])
-		{
-			return false;
-		}
-
-		return true;
 	}
 
 	/**