Since TYPO3 is using '$GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey]'
instead of the serialized '$GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extensionKey]'
the ExtensionConfigurationViewHelper should support this new configuration structure.
Since TYPO3 is using '$GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey]' instead of the serialized '$GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extensionKey]' the ExtensionConfigurationViewHelper should support this new configuration structure.