Answer: Safari

Long before people were cracking jokes about Google Chrome’s Incognito mode and the little trench coat wearing spy that peeks out of the corner when you’re using it, there was Private Browsing mode in Safari. Three years before Google, four years before Firefox and Internet Explorer, and five years before Opera, Safari had a system in place for temporarily suspending cookies and web caching to browse in private, so that whatever you were looking at, whether you were hiding Christmas shopping or a curious obsession with My Little Pony, no one would be the wiser.