If I set up multiple firefox profile, and 1 profile have a flash cookie, will it affect the other profile? If I use private proxy with the second profile, will it leaks my real IP? What really cause Proxy to leak real IP? I use hidemyass Public Proxies Anonymity level: High + PK and clear all of my cookies. The I use whatismyip (itsobviouswhatgoeshere) c()m to check my IP Most of the time the site show the proxy IP. But sometimes it show my real IP and figure out that I am behind a proxy. How did it happen? Is there a different between multiples firefox profile and multiple portable version of firefox?