In response to the growing demands for more privacy on the internet, Mozilla implements a Do Not Track option in Firefox 4.
The most recent version of Mozilla Firefox, which was rolled out this February, offers users the option to opt-out of website tracking. Once enabled, the user’s preference to not be tracked is automatically sent to the website. That doesn’t mean that the website has to do anything about it, but there will probably be a bit of a stink about those sites that don’t respect user’s privacy preferences (it would be the equivalent of someone making a sales call to you after you join the Do Not Call list). Unfortunately, most users will never know which websites are participating in the opt-out Do Not Track function.