Hi. So, custom configurations have gotten much more difficult since the browsers started enforcing CORS security to reduce cross-site-scripting attacks. It is still possible, but you will have to very carefully follow the instructions in the "about" page. I tested this on all three browsers just last week.

To save you the trouble, I just created an "Individual 1" config and put up on my server. You should see it in the drop-down menu.

Best,
Dave