Yeah, I think the root comment of this thread is talking out of his ass. Third-party trackers are not needed, and wouldn't make sense to use, to discern browser market share; browsers self-report their identity and operating system unless specifically configured not to. For example, my User-Agent string in my GET request to retrieve Hacker News is: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0".