But mainstream users of open source browsers are out of luck.

Safari and Internet Explorer have taken important steps to protect their users against web tracking: Safari blocks third party cookies out of the box, and IE offers a prominent tracker-blocking option. In her blog post, Chew flags the need for Mozilla's management to ensure that this essential protection reaches users, and to recognize that 'current advertising practices that enable 'free' content are in direct conflict with security, privacy, stability, and performance concerns.' Since advertising industry groups flatly refused to respect the Do Not Track header as a privacy opt-out from data collection, the only line of defense we have against non-consensual online tracking is our browsers.

We agree with Monica: Firefox needs to enable Tracking Protection-at least for users who enable Private Browsing mode-and make it an easy option in all cases. Despite these impressive results, Tracking Protection remains deeply hidden in the browser's most obscure settings system, and is not on track to be offered even to Firefox's beta users for testing and improvement. With Tracking Protection enabled they found that they received 67.5% fewer cookies and reduced page load time by an astonishing 44% while browsing the Alexa top 200 news sites.

Last week Monica Chew, formerly of Mozilla, and Georgios Kontaxis, of Columbia University, published a paper detailing the proposed new Firefox Tracking Protection technology.

Mail track for firefox