What browsers work with the DS-11 Passport Application Form Filler?

I'm using a 2019 i9 iMac running Sequoia 15.7.2 (this is the latest version of that OS, and is considered current).

I've tried completing the DS-11 Passport Application Form Filler with the latest versions of both Safari and Firefox, and at various points the dropdown menus become non-responsive, preventing me from proceeding.

For instance, here's a screenshot of the emergency contacts page, showing that when I click the dropdown for Country, I just get a blank oval (yes, I had listed the other info., but deleted it for the purposes of this public screenshot).

I also have access to Chrome and Edge. Do either of those work better? Or if not, do I just need to download the form and fill it in manually?

https://preview.redd.it/xdzbr9idr6ag1.png?width=1452&format=png&auto=webp&s=43ba6181f087c8f2ebaccd86d3f972bfca049c9d