[rocqua]

Many of these cookies settings can be 'unset' by browser-settings. The HTTP server can set cookies all it wants, but if your browser throws them away between sessions, they can't be used to track you between sessions. (They still can aid tracking you within sessions, to what degree that is bad depends on the specific definition of 'sessions').

Firefox has a pretty decent system for this I believe. They also try to go against alternatives like 'local-storage' and a whole slew of other attempts at fingerprinting / creating super-cookies.