How do I keep my settings private when using a public or shared computer?
Internet Explorer, Firefox, and Google Chrome all have a "Private Browsing" mode that will make any pages not show up in the browser history. It’s called "Incognito Mode" in Chrome. You can also clear the history on the browser, just to be safe.
Web sites that you log into will often have a "Remember Me" option next to the login box that you can uncheck. When you do so, this means that another person who uses the computer cannot get into the Web site.
If you are really paranoid, you can download Portable Firefox, a version of Firefox that runs off a USB drive and keeps all its settings there, away from the main Web browsers on the system.