Problems with Nabu Casa or using HA through Firefox?

Configuration
1

For the last few weeks I’ve seen more and more ‘freezes’ when I access my HA through nabu casa.
Especially when I change / add automations and restart HA.
I can’t figure out if it’s related to a problem on nabu casa or if it’s a problem with using HA through firefox.

2

I don’t use nabu casa, but Firefox is the only browser I use, and I don’t have problems with HA.

3

I use firefox mainly, and always nabu casa.
I mostly see problems when I create new automations, the popups with the entities doesn’t work properly, when you start typing it will narrow the list, and then pop back to the full list. Later if you save the automation, it doesn’t react on the save button right away, and I have to wait for it to work.