[djg38]

The ad networks and such will just track you through browser/device fingerprinting instead of cookies. Except for extremely tightly controlled, homogenous systems in corporations, it doesn't take much info beyond your IP and user agent to uniquely identify a PC. Your history/cache, fonts, plugins, screen/viewport size, etc. are all discoverable from the browser.

[gus_massa]

The EFF made an online "unicity" test one year ago: https://panopticlick.eff.org/

HN discussion: (36 comments) http://news.ycombinator.com/item?id=1082464

[wladimir]

Indeed -- it'd be the browsers job to make this kind of profiling less effective. Just restricting cookies is not enough.

Does anyone know of a firefox addon (or for another browser) that 'homogenizes' the info sent to sites?

[JoachimSchipper]

TorButton does that (and, of course, allows you to switch Tor on/off).