diff --git a/phpBB/includes/acp/acp_extensions.php b/phpBB/includes/acp/acp_extensions.php
index d5082e9727..5c589222c6 100644
--- a/phpBB/includes/acp/acp_extensions.php
+++ b/phpBB/includes/acp/acp_extensions.php
@@ -25,48 +25,49 @@ if (!defined('IN_PHPBB'))
 class acp_extensions
 {
 	var $u_action;
+	var $tpl_name;
+	var $page_title;
 
-	private $db;
 	private $config;
 	private $template;
 	private $user;
-	private $cache;
 	private $log;
 	private $request;
+	private $phpbb_dispatcher;
+	private $ext_manager;
 
 	function main()
 	{
 		// Start the page
-		global $config, $user, $template, $request, $phpbb_extension_manager, $db, $phpbb_root_path, $phpbb_log, $cache, $phpbb_dispatcher;
+		global $config, $user, $template, $request, $phpbb_extension_manager, $phpbb_root_path, $phpbb_log, $phpbb_dispatcher;
 
-		$this->db = $db;
 		$this->config = $config;
 		$this->template = $template;
 		$this->user = $user;
-		$this->cache = $cache;
 		$this->request = $request;
 		$this->log = $phpbb_log;
 		$this->phpbb_dispatcher = $phpbb_dispatcher;
+		$this->ext_manager = $phpbb_extension_manager;
 
-		$user->add_lang(array('install', 'acp/extensions', 'migrator'));
+		$this->user->add_lang(array('install', 'acp/extensions', 'migrator'));
 
 		$this->page_title = 'ACP_EXTENSIONS';
 
-		$action = $request->variable('action', 'list');
-		$ext_name = $request->variable('ext_name', '');
+		$action = $this->request->variable('action', 'list');
+		$ext_name = $this->request->variable('ext_name', '');
 
 		// What is a safe limit of execution time? Half the max execution time should be safe.
 		$safe_time_limit = (ini_get('max_execution_time') / 2);
 		$start_time = time();
 
 		// Cancel action
-		if ($request->is_set_post('cancel'))
+		if ($this->request->is_set_post('cancel'))
 		{
 			$action = 'list';
 			$ext_name = '';
 		}
 
-		if (in_array($action, array('enable', 'disable', 'delete_data')) && !check_link_hash($request->variable('hash', ''), $action . '.' . $ext_name))
+		if (in_array($action, array('enable', 'disable', 'delete_data')) && !check_link_hash($this->request->variable('hash', ''), $action . '.' . $ext_name))
 		{
 			trigger_error('FORM_INVALID', E_USER_WARNING);
 		}
@@ -96,7 +97,7 @@ class acp_extensions
 		// If they've specified an extension, let's load the metadata manager and validate it.
 		if ($ext_name)
 		{
-			$md_manager = new \phpbb\extension\metadata_manager($ext_name, $config, $phpbb_extension_manager, $phpbb_root_path);
+			$md_manager = $this->ext_manager->create_extension_metadata_manager($ext_name);
 
 			try
 			{
@@ -125,12 +126,12 @@ class acp_extensions
 						'force_unstable'	=> $force_unstable,
 					));
 
-					confirm_box(false, $user->lang('EXTENSION_FORCE_UNSTABLE_CONFIRM'), $s_hidden_fields);
+					confirm_box(false, $this->user->lang('EXTENSION_FORCE_UNSTABLE_CONFIRM'), $s_hidden_fields);
 				}
 				else
 				{
-					$config->set('extension_force_unstable', false);
-					trigger_error($user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
+					$this->config->set('extension_force_unstable', false);
+					trigger_error($this->user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
 				}
 				break;
 
@@ -138,17 +139,17 @@ class acp_extensions
 			default:
 				if (confirm_box(true))
 				{
-					$config->set('extension_force_unstable', true);
-					trigger_error($user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
+					$this->config->set('extension_force_unstable', true);
+					trigger_error($this->user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
 				}
 
-				$this->list_enabled_exts($phpbb_extension_manager);
-				$this->list_disabled_exts($phpbb_extension_manager);
-				$this->list_available_exts($phpbb_extension_manager);
+				$this->list_enabled_exts();
+				$this->list_disabled_exts();
+				$this->list_available_exts();
 
 				$this->template->assign_vars(array(
 					'U_VERSIONCHECK_FORCE' 	=> $this->u_action . '&action=list&versioncheck_force=1',
-					'FORCE_UNSTABLE'		=> $config['extension_force_unstable'],
+					'FORCE_UNSTABLE'		=> $this->config['extension_force_unstable'],
 					'U_ACTION' 				=> $this->u_action,
 				));
 
@@ -166,20 +167,20 @@ class acp_extensions
 					trigger_error($message . adm_back_link($this->u_action), E_USER_WARNING);
 				}
 
-				$extension = $phpbb_extension_manager->get_extension($ext_name);
+				$extension = $this->ext_manager->get_extension($ext_name);
 				if (!$extension->is_enableable())
 				{
-					trigger_error($user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
+					trigger_error($this->user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
 				}
 
-				if ($phpbb_extension_manager->is_enabled($ext_name))
+				if ($this->ext_manager->is_enabled($ext_name))
 				{
 					redirect($this->u_action);
 				}
 
 				$this->tpl_name = 'acp_ext_enable';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'PRE'				=> true,
 					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_ENABLE_CONFIRM', $md_manager->get_metadata('display-name')),
 					'U_ENABLE'			=> $this->u_action . '&action=enable&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('enable.' . $ext_name),
@@ -197,47 +198,47 @@ class acp_extensions
 					trigger_error($message . adm_back_link($this->u_action), E_USER_WARNING);
 				}
 
-				$extension = $phpbb_extension_manager->get_extension($ext_name);
+				$extension = $this->ext_manager->get_extension($ext_name);
 				if (!$extension->is_enableable())
 				{
-					trigger_error($user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
+					trigger_error($this->user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
 				}
 
 				try
 				{
-					while ($phpbb_extension_manager->enable_step($ext_name))
+					while ($this->ext_manager->enable_step($ext_name))
 					{
 						// Are we approaching the time limit? If so we want to pause the update and continue after refreshing
 						if ((time() - $start_time) >= $safe_time_limit)
 						{
-							$template->assign_var('S_NEXT_STEP', true);
+							$this->template->assign_var('S_NEXT_STEP', true);
 
 							meta_refresh(0, $this->u_action . '&action=enable&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('enable.' . $ext_name));
 						}
 					}
-					$this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_ENABLE', time(), array($ext_name));
+					$this->log->add('admin', $this->user->data['user_id'], $this->user->ip, 'LOG_EXT_ENABLE', time(), array($ext_name));
 				}
 				catch (\phpbb\db\migration\exception $e)
 				{
-					$template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($user));
+					$this->template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($this->user));
 				}
 
 				$this->tpl_name = 'acp_ext_enable';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'U_RETURN'		=> $this->u_action . '&action=list',
 				));
 			break;
 
 			case 'disable_pre':
-				if (!$phpbb_extension_manager->is_enabled($ext_name))
+				if (!$this->ext_manager->is_enabled($ext_name))
 				{
 					redirect($this->u_action);
 				}
 
 				$this->tpl_name = 'acp_ext_disable';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'PRE'				=> true,
 					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_DISABLE_CONFIRM', $md_manager->get_metadata('display-name')),
 					'U_DISABLE'			=> $this->u_action . '&action=disable&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('disable.' . $ext_name),
@@ -245,38 +246,38 @@ class acp_extensions
 			break;
 
 			case 'disable':
-				if (!$phpbb_extension_manager->is_enabled($ext_name))
+				if (!$this->ext_manager->is_enabled($ext_name))
 				{
 					redirect($this->u_action);
 				}
 
-				while ($phpbb_extension_manager->disable_step($ext_name))
+				while ($this->ext_manager->disable_step($ext_name))
 				{
 					// Are we approaching the time limit? If so we want to pause the update and continue after refreshing
 					if ((time() - $start_time) >= $safe_time_limit)
 					{
-						$template->assign_var('S_NEXT_STEP', true);
+						$this->template->assign_var('S_NEXT_STEP', true);
 
 						meta_refresh(0, $this->u_action . '&action=disable&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('disable.' . $ext_name));
 					}
 				}
-				$this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_DISABLE', time(), array($ext_name));
+				$this->log->add('admin', $this->user->data['user_id'], $this->user->ip, 'LOG_EXT_DISABLE', time(), array($ext_name));
 
 				$this->tpl_name = 'acp_ext_disable';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'U_RETURN'	=> $this->u_action . '&action=list',
 				));
 			break;
 
 			case 'delete_data_pre':
-				if ($phpbb_extension_manager->is_enabled($ext_name))
+				if ($this->ext_manager->is_enabled($ext_name))
 				{
 					redirect($this->u_action);
 				}
 				$this->tpl_name = 'acp_ext_delete_data';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'PRE'				=> true,
 					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_DELETE_DATA_CONFIRM', $md_manager->get_metadata('display-name')),
 					'U_PURGE'			=> $this->u_action . '&action=delete_data&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('delete_data.' . $ext_name),
@@ -284,72 +285,72 @@ class acp_extensions
 			break;
 
 			case 'delete_data':
-				if ($phpbb_extension_manager->is_enabled($ext_name))
+				if ($this->ext_manager->is_enabled($ext_name))
 				{
 					redirect($this->u_action);
 				}
 
 				try
 				{
-					while ($phpbb_extension_manager->purge_step($ext_name))
+					while ($this->ext_manager->purge_step($ext_name))
 					{
 						// Are we approaching the time limit? If so we want to pause the update and continue after refreshing
 						if ((time() - $start_time) >= $safe_time_limit)
 						{
-							$template->assign_var('S_NEXT_STEP', true);
+							$this->template->assign_var('S_NEXT_STEP', true);
 
 							meta_refresh(0, $this->u_action . '&action=delete_data&ext_name=' . urlencode($ext_name) . '&hash=' . generate_link_hash('delete_data.' . $ext_name));
 						}
 					}
-					$this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_PURGE', time(), array($ext_name));
+					$this->log->add('admin', $this->user->data['user_id'], $this->user->ip, 'LOG_EXT_PURGE', time(), array($ext_name));
 				}
 				catch (\phpbb\db\migration\exception $e)
 				{
-					$template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($user));
+					$this->template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($this->user));
 				}
 
 				$this->tpl_name = 'acp_ext_delete_data';
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'U_RETURN'	=> $this->u_action . '&action=list',
 				));
 			break;
 
 			case 'details':
 				// Output it to the template
-				$md_manager->output_template_data($template);
-
 				$meta = $md_manager->get_metadata('all');
+				$this->output_metadata_to_template($meta);
+
 				if (isset($meta['extra']['version-check']))
 				{
 					try
 					{
-						$updates_available = $phpbb_extension_manager->version_check($md_manager, $request->variable('versioncheck_force', false), false, $this->config['extension_force_unstable'] ? 'unstable' : null);
+						$updates_available = $this->ext_manager->version_check($md_manager, $this->request->variable('versioncheck_force', false), false, $this->config['extension_force_unstable'] ? 'unstable' : null);
 
-						$template->assign_vars(array(
+						$this->template->assign_vars(array(
 							'S_UP_TO_DATE' => empty($updates_available),
 							'UP_TO_DATE_MSG' => $this->user->lang(empty($updates_available) ? 'UP_TO_DATE' : 'NOT_UP_TO_DATE', $md_manager->get_metadata('display-name')),
 						));
 
-						$template->assign_block_vars('updates_available', $updates_available);
+						$this->template->assign_block_vars('updates_available', $updates_available);
 					}
 					catch (exception_interface $e)
 					{
 						$message = call_user_func_array(array($this->user, 'lang'), array_merge(array($e->getMessage()), $e->get_parameters()));
 
-						$template->assign_vars(array(
+						$this->template->assign_vars(array(
 							'S_VERSIONCHECK_FAIL' => true,
 							'VERSIONCHECK_FAIL_REASON' => ($e->getMessage() !== 'VERSIONCHECK_FAIL') ? $message : '',
 						));
 					}
-					$template->assign_var('S_VERSIONCHECK', true);
+					$this->template->assign_var('S_VERSIONCHECK', true);
 				}
 				else
 				{
-					$template->assign_var('S_VERSIONCHECK', false);
+					$this->template->assign_var('S_VERSIONCHECK', false);
 				}
 
-				$template->assign_vars(array(
+				$this->template->assign_vars(array(
 					'U_BACK'				=> $this->u_action . '&action=list',
 					'U_VERSIONCHECK_FORCE'	=> $this->u_action . '&action=details&versioncheck_force=1&ext_name=' . urlencode($md_manager->get_metadata('name')),
 				));
@@ -383,16 +384,15 @@ class acp_extensions
 	/**
 	* Lists all the enabled extensions and dumps to the template
 	*
-	* @param  $phpbb_extension_manager     An instance of the extension manager
 	* @return null
 	*/
-	public function list_enabled_exts(\phpbb\extension\manager $phpbb_extension_manager)
+	public function list_enabled_exts()
 	{
 		$enabled_extension_meta_data = array();
 
-		foreach ($phpbb_extension_manager->all_enabled() as $name => $location)
+		foreach ($this->ext_manager->all_enabled() as $name => $location)
 		{
-			$md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name);
+			$md_manager = $this->ext_manager->create_extension_metadata_manager($name);
 
 			try
 			{
@@ -407,7 +407,7 @@ class acp_extensions
 					try
 					{
 						$force_update = $this->request->variable('versioncheck_force', false);
-						$updates = $phpbb_extension_manager->version_check($md_manager, $force_update, !$force_update);
+						$updates = $this->ext_manager->version_check($md_manager, $force_update, !$force_update);
 
 						$enabled_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
 						$enabled_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
@@ -455,16 +455,15 @@ class acp_extensions
 	/**
 	* Lists all the disabled extensions and dumps to the template
 	*
-	* @param  $phpbb_extension_manager     An instance of the extension manager
 	* @return null
 	*/
-	public function list_disabled_exts(\phpbb\extension\manager $phpbb_extension_manager)
+	public function list_disabled_exts()
 	{
 		$disabled_extension_meta_data = array();
 
-		foreach ($phpbb_extension_manager->all_disabled() as $name => $location)
+		foreach ($this->ext_manager->all_disabled() as $name => $location)
 		{
-			$md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name);
+			$md_manager = $this->ext_manager->create_extension_metadata_manager($name);
 
 			try
 			{
@@ -477,7 +476,7 @@ class acp_extensions
 				if (isset($meta['extra']['version-check']))
 				{
 					$force_update = $this->request->variable('versioncheck_force', false);
-					$updates = $phpbb_extension_manager->version_check($md_manager, $force_update, !$force_update);
+					$updates = $this->ext_manager->version_check($md_manager, $force_update, !$force_update);
 
 					$disabled_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
 					$disabled_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
@@ -525,18 +524,17 @@ class acp_extensions
 	/**
 	* Lists all the available extensions and dumps to the template
 	*
-	* @param  $phpbb_extension_manager     An instance of the extension manager
 	* @return null
 	*/
-	public function list_available_exts(\phpbb\extension\manager $phpbb_extension_manager)
+	public function list_available_exts()
 	{
-		$uninstalled = array_diff_key($phpbb_extension_manager->all_available(), $phpbb_extension_manager->all_configured());
+		$uninstalled = array_diff_key($this->ext_manager->all_available(), $this->ext_manager->all_configured());
 
 		$available_extension_meta_data = array();
 
 		foreach ($uninstalled as $name => $location)
 		{
-			$md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name);
+			$md_manager = $this->ext_manager->create_extension_metadata_manager($name);
 
 			try
 			{
@@ -549,7 +547,7 @@ class acp_extensions
 				if (isset($meta['extra']['version-check']))
 				{
 					$force_update = $this->request->variable('versioncheck_force', false);
-					$updates = $phpbb_extension_manager->version_check($md_manager, $force_update, !$force_update);
+					$updates = $this->ext_manager->version_check($md_manager, $force_update, !$force_update);
 
 					$available_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
 					$available_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
@@ -614,4 +612,41 @@ class acp_extensions
 	{
 		return strnatcasecmp($val1['META_DISPLAY_NAME'], $val2['META_DISPLAY_NAME']);
 	}
+
+	/**
+	* Outputs extension metadata into the template
+	*
+	* @param array $metadata Array with all metadata for the extension
+	* @return null
+	*/
+	public function output_metadata_to_template($metadata)
+	{
+		$this->template->assign_vars(array(
+			'META_NAME'			=> $metadata['name'],
+			'META_TYPE'			=> $metadata['type'],
+			'META_DESCRIPTION'	=> (isset($metadata['description'])) ? $metadata['description'] : '',
+			'META_HOMEPAGE'		=> (isset($metadata['homepage'])) ? $metadata['homepage'] : '',
+			'META_VERSION'		=> $metadata['version'],
+			'META_TIME'			=> (isset($metadata['time'])) ? $metadata['time'] : '',
+			'META_LICENSE'		=> $metadata['license'],
+
+			'META_REQUIRE_PHP'		=> (isset($metadata['require']['php'])) ? $metadata['require']['php'] : '',
+			'META_REQUIRE_PHP_FAIL'	=> (isset($metadata['require']['php'])) ? false : true,
+
+			'META_REQUIRE_PHPBB'		=> (isset($metadata['extra']['soft-require']['phpbb/phpbb'])) ? $metadata['extra']['soft-require']['phpbb/phpbb'] : '',
+			'META_REQUIRE_PHPBB_FAIL'	=> (isset($metadata['extra']['soft-require']['phpbb/phpbb'])) ? false : true,
+
+			'META_DISPLAY_NAME'	=> (isset($metadata['extra']['display-name'])) ? $metadata['extra']['display-name'] : '',
+		));
+
+		foreach ($metadata['authors'] as $author)
+		{
+			$this->template->assign_block_vars('meta_authors', array(
+				'AUTHOR_NAME'		=> $author['name'],
+				'AUTHOR_EMAIL'		=> (isset($author['email'])) ? $author['email'] : '',
+				'AUTHOR_HOMEPAGE'	=> (isset($author['homepage'])) ? $author['homepage'] : '',
+				'AUTHOR_ROLE'		=> (isset($author['role'])) ? $author['role'] : '',
+			));
+		}
+	}
 }
diff --git a/phpBB/phpbb/console/command/update/check.php b/phpBB/phpbb/console/command/update/check.php
index 1f1cfa25d2..ed8ad79eea 100644
--- a/phpBB/phpbb/console/command/update/check.php
+++ b/phpBB/phpbb/console/command/update/check.php
@@ -134,7 +134,7 @@ class check extends \phpbb\console\command\command
 		try
 		{
 			$ext_manager = $this->phpbb_container->get('ext.manager');
-			$md_manager = $ext_manager->create_extension_metadata_manager($ext_name, null);
+			$md_manager = $ext_manager->create_extension_metadata_manager($ext_name);
 			$updates_available = $ext_manager->version_check($md_manager, $recheck, false, $stability);
 
 			$metadata = $md_manager->get_metadata('all');
diff --git a/phpBB/phpbb/extension/manager.php b/phpBB/phpbb/extension/manager.php
index e3e6fe4077..00aa2c6826 100644
--- a/phpBB/phpbb/extension/manager.php
+++ b/phpBB/phpbb/extension/manager.php
@@ -152,7 +152,12 @@ class manager
 	*/
 	public function create_extension_metadata_manager($name)
 	{
-		return new \phpbb\extension\metadata_manager($name, $this->config, $this, $this->phpbb_root_path);
+		if (!isset($this->extensions[$name]['metadata']))
+		{
+			$metadata = new \phpbb\extension\metadata_manager($name, $this->get_extension_path($name, true));
+			$this->extensions[$name]['metadata'] = $metadata;
+		}
+		return $this->extensions[$name]['metadata'];
 	}
 
 	/**
@@ -168,7 +173,7 @@ class manager
 	public function enable_step($name)
 	{
 		// ignore extensions that are already enabled
-		if (isset($this->extensions[$name]) && $this->extensions[$name]['ext_active'])
+		if ($this->is_enabled($name))
 		{
 			return false;
 		}
@@ -258,7 +263,7 @@ class manager
 	public function disable_step($name)
 	{
 		// ignore extensions that are already disabled
-		if (!isset($this->extensions[$name]) || !$this->extensions[$name]['ext_active'])
+		if ($this->is_disabled($name))
 		{
 			return false;
 		}
@@ -336,8 +341,8 @@ class manager
 	*/
 	public function purge_step($name)
 	{
-		// ignore extensions that do not exist
-		if (!isset($this->extensions[$name]))
+		// ignore extensions that are not configured
+		if (!$this->is_configured($name))
 		{
 			return false;
 		}
@@ -431,25 +436,11 @@ class manager
 			if ($file_info->isFile() && $file_info->getFilename() == 'composer.json')
 			{
 				$ext_name = $iterator->getInnerIterator()->getSubPath();
-				$composer_file = $iterator->getPath() . '/composer.json';
-
-				// Ignore the extension if there is no composer.json.
-				if (!is_readable($composer_file) || !($ext_info = file_get_contents($composer_file)))
-				{
-					continue;
-				}
-
-				$ext_info = json_decode($ext_info, true);
 				$ext_name = str_replace(DIRECTORY_SEPARATOR, '/', $ext_name);
-
-				// Ignore the extension if directory depth is not correct or if the directory structure
-				// does not match the name value specified in composer.json.
-				if (substr_count($ext_name, '/') !== 1 || !isset($ext_info['name']) || $ext_name != $ext_info['name'])
+				if ($this->is_available($ext_name))
 				{
-					continue;
+					$available[$ext_name] = $this->get_extension_path($ext_name, true);
 				}
-
-				$available[$ext_name] = $this->phpbb_root_path . 'ext/' . $ext_name . '/';
 			}
 		}
 		ksort($available);
@@ -472,8 +463,12 @@ class manager
 		$configured = array();
 		foreach ($this->extensions as $name => $data)
 		{
-			$data['ext_path'] = ($phpbb_relative ? $this->phpbb_root_path : '') . $data['ext_path'];
-			$configured[$name] = $data;
+			if ($this->is_configured($name))
+			{
+				unset($data['metadata']);
+				$data['ext_path'] = ($phpbb_relative ? $this->phpbb_root_path : '') . $data['ext_path'];
+				$configured[$name] = $data;
+			}
 		}
 		return $configured;
 	}
@@ -490,7 +485,7 @@ class manager
 		$enabled = array();
 		foreach ($this->extensions as $name => $data)
 		{
-			if ($data['ext_active'])
+			if ($this->is_enabled($name))
 			{
 				$enabled[$name] = ($phpbb_relative ? $this->phpbb_root_path : '') . $data['ext_path'];
 			}
@@ -511,7 +506,7 @@ class manager
 		$disabled = array();
 		foreach ($this->extensions as $name => $data)
 		{
-			if (!$data['ext_active'])
+			if ($this->is_disabled($name))
 			{
 				$disabled[$name] = ($phpbb_relative ? $this->phpbb_root_path : '') . $data['ext_path'];
 			}
@@ -527,7 +522,15 @@ class manager
 	*/
 	public function is_available($name)
 	{
-		return file_exists($this->get_extension_path($name, true));
+		$md_manager = $this->create_extension_metadata_manager($name);
+		try
+		{
+			return $md_manager->get_metadata('all') && $md_manager->validate_enable();
+		}
+		catch (\phpbb\extension\exception $e)
+		{
+			return false;
+		}
 	}
 
 	/**
@@ -538,7 +541,7 @@ class manager
 	*/
 	public function is_enabled($name)
 	{
-		return isset($this->extensions[$name]) && $this->extensions[$name]['ext_active'];
+		return isset($this->extensions[$name]['ext_active']) && $this->extensions[$name]['ext_active'];
 	}
 
 	/**
@@ -549,7 +552,7 @@ class manager
 	*/
 	public function is_disabled($name)
 	{
-		return isset($this->extensions[$name]) && !$this->extensions[$name]['ext_active'];
+		return isset($this->extensions[$name]['ext_active']) && !$this->extensions[$name]['ext_active'];
 	}
 
 	/**
@@ -563,7 +566,7 @@ class manager
 	*/
 	public function is_configured($name)
 	{
-		return isset($this->extensions[$name]);
+		return isset($this->extensions[$name]['ext_active']);
 	}
 
 	/**
diff --git a/phpBB/phpbb/extension/metadata_manager.php b/phpBB/phpbb/extension/metadata_manager.php
index 6fc6dc9891..7eb5f94f60 100644
--- a/phpBB/phpbb/extension/metadata_manager.php
+++ b/phpBB/phpbb/extension/metadata_manager.php
@@ -18,24 +18,6 @@ namespace phpbb\extension;
 */
 class metadata_manager
 {
-	/**
-	* phpBB Config instance
-	* @var \phpbb\config\config
-	*/
-	protected $config;
-
-	/**
-	* phpBB Extension Manager
-	* @var \phpbb\extension\manager
-	*/
-	protected $extension_manager;
-
-	/**
-	* phpBB root path
-	* @var string
-	*/
-	protected $phpbb_root_path;
-
 	/**
 	* Name (including vendor) of the extension
 	* @var string
@@ -58,19 +40,13 @@ class metadata_manager
 	* Creates the metadata manager
 	*
 	* @param string				$ext_name			Name (including vendor) of the extension
-	* @param \phpbb\config\config		$config				phpBB Config instance
-	* @param \phpbb\extension\manager	$extension_manager	An instance of the phpBB extension manager
-	* @param string				$phpbb_root_path	Path to the phpbb includes directory.
+	* @param string				$ext_path			Path to the extension directory including root path
 	*/
-	public function __construct($ext_name, \phpbb\config\config $config, \phpbb\extension\manager $extension_manager, $phpbb_root_path)
+	public function __construct($ext_name, $ext_path)
 	{
-		$this->config = $config;
-		$this->extension_manager = $extension_manager;
-		$this->phpbb_root_path = $phpbb_root_path;
-
 		$this->ext_name = $ext_name;
 		$this->metadata = array();
-		$this->metadata_file = '';
+		$this->metadata_file = $ext_path . 'composer.json';
 	}
 
 	/**
@@ -81,13 +57,11 @@ class metadata_manager
 	*/
 	public function get_metadata($element = 'all')
 	{
-		$this->set_metadata_file();
-
-		// Fetch the metadata
-		$this->fetch_metadata();
-
-		// Clean the metadata
-		$this->clean_metadata_array();
+		// Fetch and clean the metadata if not done yet
+		if ($this->metadata === array())
+		{
+			$this->fetch_metadata_from_file();
+		}
 
 		switch ($element)
 		{
@@ -110,52 +84,29 @@ class metadata_manager
 	}
 
 	/**
-	* Sets the filepath of the metadata file
+	* Gets the metadata file contents and cleans loaded file
 	*
 	* @throws \phpbb\extension\exception
 	*/
-	private function set_metadata_file()
-	{
-		$ext_filepath = $this->extension_manager->get_extension_path($this->ext_name);
-		$metadata_filepath = $this->phpbb_root_path . $ext_filepath . 'composer.json';
-
-		$this->metadata_file = $metadata_filepath;
-
-		if (!file_exists($this->metadata_file))
-		{
-			throw new \phpbb\extension\exception('FILE_NOT_FOUND', array($this->metadata_file));
-		}
-	}
-
-	/**
-	* Gets the contents of the composer.json file
-	*
-	* @return bool True if success, throws an exception on failure
-	* @throws \phpbb\extension\exception
-	*/
-	private function fetch_metadata()
+	private function fetch_metadata_from_file()
 	{
 		if (!file_exists($this->metadata_file))
 		{
 			throw new \phpbb\extension\exception('FILE_NOT_FOUND', array($this->metadata_file));
 		}
-		else
+
+		if (!($file_contents = file_get_contents($this->metadata_file)))
 		{
-			if (!($file_contents = file_get_contents($this->metadata_file)))
-			{
-				throw new \phpbb\extension\exception('FILE_CONTENT_ERR', array($this->metadata_file));
-			}
-
-			if (($metadata = json_decode($file_contents, true)) === null)
-			{
-				throw new \phpbb\extension\exception('FILE_JSON_DECODE_ERR', array($this->metadata_file));
-			}
-
-			array_walk_recursive($metadata, array($this, 'sanitize_json'));
-			$this->metadata = $metadata;
-
-			return true;
+			throw new \phpbb\extension\exception('FILE_CONTENT_ERR', array($this->metadata_file));
 		}
+
+		if (($metadata = json_decode($file_contents, true)) === null)
+		{
+			throw new \phpbb\extension\exception('FILE_JSON_DECODE_ERR', array($this->metadata_file));
+		}
+
+		array_walk_recursive($metadata, array($this, 'sanitize_json'));
+		$this->metadata = $metadata;
 	}
 
 	/**
@@ -169,16 +120,6 @@ class metadata_manager
 		$value = htmlspecialchars($value);
 	}
 
-	/**
-	* This array handles the cleaning of the array
-	*
-	* @return array Contains the cleaned metadata array
-	*/
-	private function clean_metadata_array()
-	{
-		return $this->metadata;
-	}
-
 	/**
 	* Validate fields
 	*
@@ -201,8 +142,23 @@ class metadata_manager
 		switch ($name)
 		{
 			case 'all':
-				$this->validate_enable();
-				// no break
+				$this->validate('display');
+
+				if (!$this->validate_dir())
+				{
+					throw new \phpbb\extension\exception('EXTENSION_DIR_INVALID');
+				}
+
+				if (!$this->validate_require_phpbb())
+				{
+					throw new \phpbb\extension\exception('META_FIELD_NOT_SET', array('soft-require'));
+				}
+
+				if (!$this->validate_require_php())
+				{
+					throw new \phpbb\extension\exception('META_FIELD_NOT_SET', array('require php'));
+				}
+			break;
 
 			case 'display':
 				foreach ($fields as $field => $data)
@@ -316,40 +272,4 @@ class metadata_manager
 
 		return true;
 	}
-
-	/**
-	* Outputs the metadata into the template
-	*
-	* @param \phpbb\template\template	$template	phpBB Template instance
-	*/
-	public function output_template_data(\phpbb\template\template $template)
-	{
-		$template->assign_vars(array(
-			'META_NAME'			=> $this->metadata['name'],
-			'META_TYPE'			=> $this->metadata['type'],
-			'META_DESCRIPTION'	=> (isset($this->metadata['description'])) ? $this->metadata['description'] : '',
-			'META_HOMEPAGE'		=> (isset($this->metadata['homepage'])) ? $this->metadata['homepage'] : '',
-			'META_VERSION'		=> (isset($this->metadata['version'])) ? $this->metadata['version'] : '',
-			'META_TIME'			=> (isset($this->metadata['time'])) ? $this->metadata['time'] : '',
-			'META_LICENSE'		=> $this->metadata['license'],
-
-			'META_REQUIRE_PHP'		=> (isset($this->metadata['require']['php'])) ? $this->metadata['require']['php'] : '',
-			'META_REQUIRE_PHP_FAIL'	=> (isset($this->metadata['require']['php'])) ? false : true,
-
-			'META_REQUIRE_PHPBB'		=> (isset($this->metadata['extra']['soft-require']['phpbb/phpbb'])) ? $this->metadata['extra']['soft-require']['phpbb/phpbb'] : '',
-			'META_REQUIRE_PHPBB_FAIL'	=> (isset($this->metadata['extra']['soft-require']['phpbb/phpbb'])) ? false : true,
-
-			'META_DISPLAY_NAME'	=> (isset($this->metadata['extra']['display-name'])) ? $this->metadata['extra']['display-name'] : '',
-		));
-
-		foreach ($this->metadata['authors'] as $author)
-		{
-			$template->assign_block_vars('meta_authors', array(
-				'AUTHOR_NAME'		=> $author['name'],
-				'AUTHOR_EMAIL'		=> (isset($author['email'])) ? $author['email'] : '',
-				'AUTHOR_HOMEPAGE'	=> (isset($author['homepage'])) ? $author['homepage'] : '',
-				'AUTHOR_ROLE'		=> (isset($author['role'])) ? $author['role'] : '',
-			));
-		}
-	}
 }
diff --git a/tests/extension/metadata_manager_test.php b/tests/extension/metadata_manager_test.php
index ce675f0d36..8ef41f3673 100644
--- a/tests/extension/metadata_manager_test.php
+++ b/tests/extension/metadata_manager_test.php
@@ -364,9 +364,7 @@ class phpbb_extension_metadata_manager_test extends phpbb_database_test_case
 	{
 		return new phpbb_mock_metadata_manager(
 			$ext_name,
-			$this->config,
-			$this->extension_manager,
-			$this->phpbb_root_path
+			$this->extension_manager->get_extension_path($ext_name, true)
 		);
 	}
 }