F.T.C. Online Privacy Plan Seeks ‘Do Not Track’ Option
nytimes.com
nytimes.com
Today, the analytics and advertising industries increasingly self-regulate, cookie-based opt-outs are usually available, and concerned users can quite effectively opt-out through technical means. Should the FTC or Congress mandate opt-in or even a broadly promoted 'do not track' list, companies will quickly protect their revenues by making opt-in mandatory for content access - and the opt-in that's required will likely be a whole lot more intrusive than the relatively benign tracking that takes place today.
https://addons.mozilla.org/en-US/firefox/addon/180650/
I think it's an acceptable compromise to use such an extension.
So, I think if they were to follow through with this plan, they probably wouldn't deal with lists or anything, but would have each browser send a blip to the website saying the user is opted in.