Interesting idea but not exactly fast it took like 3min for a 350 comment post to show up. I know this is a basic problem dealing with the Firebase API but I think you can structure a search request to Algolia and get all the results at once ? Also l like the dots to show tree depth of each comment it would be more help to see the parent comment by link or something. Easy. Clean. Simple. So nice work!
This is the first comment as example, go try another post. This solution is mainly to make it easy for the poster, to be able to follow up comments here on HN more easily