I’ve been using Paprika for years now. It works really well and has all the features I need. It works with Apple’s family sharing, so other family members can access it, too. Highly recommend.

I’ve had similar experiences with FF and HA. I tried everything that has been suggested to you and kept having problems. In the end I installed Brave just for HA. I still use FF for everything else.

If you have a Zigbee Coordinator, I’d recommend taking a look a Aqara.