I’d never feed a fox! They will proliferate if you give them a food source.
People have been feeding them in urban areas for years and so the population has risen as a result. They get easy pickings from people who don’t dispose of their waste properly, but the introduction of wheelie bins has made them more detemined to get a food source. They are no longer scared of humans and I often see them trotting around without too much concern for our presence. There have been a couple of attacks of small children and babies which have hit the headlines, which is purely a product of people tolerating these wild animals.
So, don’t do it! Even if you do love animals.