The issues have very little to do with the age of the OS. If someone was asking how to get Firefox running on an embedded Linux machine operating a saw, I would

The issues have very little to do with the age of the OS. If someone was asking how to get Firefox running on an embedded Linux machine operating a saw, I would expect most people to be saying roughly the same thing: Don't mess with a sensitive piece of software, buy a dedicated machine to run your timecard system.