I would personally like to punch every Firefox developer in the face.
What this means is that Firefox now prevents you from logging into any older device such as routers, switches, RAID systems, load balancers, and so, so many more devices that lack certain newer security measures (don’t feel like explaining it all here).
Most of these devices are not capable of being updated to something new. Either the vendor does not have an update or is out of business.
These sort of devices are not rare. At the last place I worked, there were probably 20-30 of them on the network.
This is not at all unusual.
So it means that these devices – which all have web interfaces (only) – can not be managed by Firefox. At all. With no way to override this idiotic behavior.
What are these annoying fucklet developers even thinking? Are they even thinking?
When you are so convinced you are right, not even the dumbest thing possible can convince you of anything else.