I am so late on this. While doing some local DevOps stuff on my machine in preparation for a project, I decided to update my vastly outdated version of PGAdmin to the current v4 3.5. I was a bit nonplussed to find it loading in a browser tab – so I did some light digging and it turns out this happened several minor versions ago. Here’s more info: https://www.postgresql.org/about/news/1846/