A method which may allow a user to create more than one online identity in a Web browser, and associate each online identity with one type of intended online activity. The user may be able to switch to a different online identity without logging out from his/her computer or Web browser. The invention may help users to evade websites' tracking and targeting functions and protect users' privacy. Since each online identity may be associated with only a part of a user's browsing history, it is difficult for websites to collect all information about the user.