Convert firebase project to be used multiple times on the same page

Working on a proof of concept, taking a firebase example and have the ability to have it multiple times on the same page. Goal is to use this chat feature as a comment system for multiple articles on the same page. So each instance of chat would need to tied to its own collection. I attached the sample code that needs to be converted or you could do it from scratch. All code needs to be in html and regular javascript (no angular)