You can enable Toast Notifications for both Frontend and Backend Magento areas. Besides, you can configure the extension for the store and for the admin part separately on the Toast Notifications extension settings page in Magento Backend.
Toast Notifications will show your customers one or several messages that Magento sends. The message queue can have one or different types of messages, e.g. Magento error messages and success notifications. The extension will handle them in both cases and do its job very well.
Toast Notifications doesn't require additional Java Script frameworks, it uses Prototype JS library that comes with Magento by default.