Considering recent chrome, firefox user agent contains id string of almost every browser in existence, this is so true:
Mozilla/5.0 (...) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Mozilla/5.0 (...) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36