When they're kits they can be tamed somewhat but when they mature nature normally takes over.
Yes as long as they are caught young they make great pets and any hunter will buy there urine for scent cover !
Yes. Some fox are naturally less afraid of humans and therefore can be made into pets if hand raised early enough.
Russian scientists were able to breed a domestic fox:
Foxes like wolves cannot be completely domesticated.
In about 1000 generations it might be possible but not likely.
Humans have domesticated animals for many thousands of years and all the ones that were amenable have already been done.
Foxes are singular animals rather than pack animals. It is the pack mutual need that allowed the wolf to be domesticated. The wolf just transferred it's need for a pack from 4 footed and furry to 2 footed and relatively hairless.
A fox could be tamed down but since it doesn't have any need for community it would have no need to please. It likely would not be trainable.
If you get them very young--yes. As an aside, some people (a sister of mine included) actually have descented skunks! Like a fox--it has to be VERY young (and in the case of a skunk--from a breeding establishment due to rabies)
Be careful, some localities have laws strictly prohibiting domesticating wild critters. Some do not enforce that rule though.
I had a pet fox when I was a child, and I can testify that they make the most delightful and intelligent pets in the world, combining all of the best features of a cat and a dog. They are brilliantly intelligent, funny, resourceful, amazing. However, you cannot really domesticate one who has grown to adulthood in the wild; you cannot housebreak them; you cannot trust them not to run away; and they are not legal as pets in most states so you can't get veterinary care for them.