“Anonymity on the Internet is hard, and simple recipes like this one will not work. The least troublesome method that is still effective is to browse only in Private mode, and close the tabs as you switch sites. Watch the cookies. Install add-ons that mess with the signature of your browser. Have multiple browsers, multiple OSes (in separate VMs.) Rememember that your IP address is largely fixed, unless you are connecting from a large NAT.”
Or use a proxy. ;-)
There aren't too many open proxies that you can trust. I don't know any, for example. Of course, proxies come included with TOR and I2P, but TOR seems to be compromised, and I2P is too complex for a common man to set up.