Safari’s private browsing is genuinely private. Other browsers operate the same way, but “this won't happen in Safari, as it provides a separate session for each private window and tab.”
This isn’t as bad as direct tracking in normal browsing, “but if the user has logged in, a service can associate reference information in the link with their account. “While third-party cookies are blocked by default in Incognito mode,” they warn, “third-party iframes such as Twitter and Facebook embeds, can under certain conditions still track users.” Security researchers Tommy Mysk and Talal Haj Bakry ( ), the duo that exposed Apple’s clipboard issue, have pulled together a video showing how these private session leaks create privacy breaches.