Is Firebase hosting free?

So, anyone who knows the URL can access it.

Firebase hosting is not only free service , its an easy way to host as well, as its default provides the SSL certificate so that your website will be hosted securely with HTTPS. Many of the hosting servers are in paid with slow speed.

Firebase is a comprehensive app platform built on Google’s infrastructure, therefore it provides a secure, fast, free (paid options also available for additional resources) and easy way to host your content on the web or mobile applications.