Nope, any browser should work. The compose file in my repo should be exposing qbittorrent on port 8080 (line 27 in the file). I would say first:

1. make sure the containers are running, use podman-compose ps or docker-compose ps from the folder that contains the compose file
2. use ping to make sure you can reach the server
3. use ss or netstat on your server to make sure it's actually listening on the port you expect qBittorrent to be listening on (8080 unless you changed it)
4. view logs using podman-compose logs from the folder that contains the compose file
5. if you can see the web ui but don't know what the password is, use podman-compose logs and you should see the temporary password generated by qBittorrent (this is explained in the guide)