I have found FireFox demands perfect HTML/CSS formatting. Chrome and Edge (same engine) allows errors in code and makes assumptions.pete_c said:Firefox here in the midwest doesn't work for me unless I use safe mode (with no add ons).
It doesn't work in Windows 10 either for just Cocoontech. Edge works fine here.
Using Chrome (which I hate) which works fine in Ubuntu Linux 18.04 (laptop).
Interesting too that Firefox doesn't work anymore with the HA GUI and had to switch to Chrome for that too.
All this via PFSense firewall.