Years ago,
Firestone and Goodyear sold white goods, and a small selection of electronics. Some name brand, some private label. One of my aunts, she of the Bendix Duomatic, had a Firestone brand hi-fi. My guess, and it is only a guess, was that they were trying to compete with Sears and WesternAuto.
The last time I saw an appliance at Firestone was a KitchenAid portable dishwasher around 1977. It was the front loading sort with the backsplash controls.
Lawrence/Maytagbear