Google said on its blog page that its new extension permits the user to block all tracking by anyone, rather than company by company as is currently offered by a consortium of marketing and advertising organizations.
Chrome's approach to do not track also is slightly different from other browsers. IE9, to be released later this year, will require users to create lists of third-party websites they want to block from tracking their behavior. Mozilla is considering adding a signal to Firefox 4, to debut next month, to let users automatically ask websites not to track their online activities.
Google's Keep My Opt-outs extension is available from the Chrome Web Store.