Google Disconnect has been replaced by Disconnect. Please use it instead.
Google is notified whenever you visit one of the more than 25 percent of sites on the web that include Google widgets (see http://www.youtube.com/watch?v=BK_E3Bjpe0E).
Turn off the flow of your data to them!
Google Disconnect blocks traffic from third-party sites to Google servers but still lets you access Google services.
Instructions: The add-on displays an icon in the location bar if a page initiates Google requests. You can block or unblock the requests by clicking the icon. Your preference will be remembered the next time you’re on the site.