Bridgestone and Firestone are part of the same company as of 2015. Firestone has been a subsidiary company of Bridgestone since Bridgestone purchased Firestone in 1988.
The Bridgestone tire and rubber company was founded in 1933 in Japan; its name comes from a literal translation of the Japanese word for a stone bridge, referencing the surname of the company's founder.
Firestone was founded in 1900 in Akron, Ohio and achieved much of its early success by serving as the original equipment manufacturer for Ford vehicles during the Model T era. Firestone encountered serious financial troubles during the 1970s, allowing Bridgestone to absorb the company in 1988.