neongreen, you should really test how it works on Firefox. For example sing in with Github bricked (pun intended ;) ) my tab with your site, even refresh button and address bar stopped working. I had to close it and open again to see the dashboard.

Steps:

- click on "get started"

- I choose option to sing in with google.

- it opens google api in separate modal window and this does not work if you have Firefox extension to keep google in container

- so I clicked github option, and authorized your app

- after that, brick.do page has been frozen completely