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However, it's important to clarify that the Firefox update doesn't unlock the capability to block third-party cookies. Users can already do that using a setting found within the "Privacy" tab of Firefox's general Options menu.

I guess this is the "tell websites I do not want to be tracked" option?

Both website creators and browser developers have worked on ways to deal with this issue. For example, they've developed a "do not track" signal that involves the browser telling sites the user doesn't want to be tracked by third-party cookies. The problem is that these solutions rely on advertisers agreeing to take heed of such signals. Now, Mozilla has taken a more drastic measure. Starting this summer, Firefox's default setting will be to simply block any cookies that don't come directly from the website the user is visiting. Now its the default. - http://www.infopackets.com/news/internet/2013/20130226_mozilla_firefox_no_more_third_party_cookies.htm

Here’s how the new patch changed the extent to which I was tracked:

Current Default: Allow All Cookies	Proposed New Default: Allow Cookies Only From Visited Domains
4 web sites used 8 first party domains	4 web sites used 8 first party domains
81 cookies from first party domains	75 cookies from first party domains
117 third party domains	0 third party domains
304 cookies from third party domains	0 cookies from third party domains
Total: 385 first & third party cookies	Total: 75 first party cookies