Often a friend will want to use my computer when I was just using it, so I'll give it to him/her, but I don't like the fact that my history and google searches, etc. can be seen. I tried downloading a separate browser, like Chrome, but the history is still synced between the two. Is there a way to have a completely different browser without having to log out and in to a guest user account? I know what I'm asking for is quite unusual though and thus unlikely.