Skip to navigation
Latest News

Privacy expert adds "Do Not Track" to Google Chrome


By Stewart Mitchell

Posted on 13 Jan 2012 at 11:20

A privacy expert at Stanford University has released a Do Not Track extension for Google's Chrome browser, which could help end-users avoid being followed by some behavioural advertising companies.

The Do Not Track header is a technology and policy programme designed to allow consumers to opt out of tracking used by targeted advertising networks, but until now there had been no way of adding the feature to Chrome.

“The Chrome extension I developed adds the Do Not Track header (DNT: 1) to HTTP requests,” privacy specialist Jonathan Mayer told PC Pro. “All the other major browsers have had a Do Not Track option for quite some time - this extension allows Chrome users to finally take advantage of Do Not Track.”

Although Google does include privacy options that retain opt-out cookies when a user deletes general browsing cookies, it has come under fire from privacy advocates for not implementing Do Not Track, even though the technology remains in its early stages.

Google's position has been heavily criticised by advocates, academics, and policy makers

“Google has steadfastly refused to add the feature to Chrome,” Mayer said. “Google's position has been heavily criticised by advocates, academics, and policy makers - including the FTC.”

Mayer was able to complete the tool after Google released a non-experimental version of the Chrome WebRequest API, which allows extensions to do much more to protect user security and privacy.

The scheme still has its shortcomings, however, and one of the criticisms is that advertisers are not legally required to take any notice of the presence of a Do Not Track header, which means unscrupulous websites could ignore privacy requests.

“Do Not Track is a preference-signalling mechanism, so yes, websites have to add support for it," Mayer said, adding that additional tools could be used to keep tracking companies honest.

“There was some early criticism of Do Not Track for being unenforceable, but that line has largely faded, partly because researchers have demonstrated again and again how web measurement tools can catch bad actors.”

The blocker is available from the Chrome web store, but Mayer cautioned that the extension requires Chrome 17 or later. For anyone running the default Release build, the extension will not successfully install until late January 2012, he said.

Subscribe to PC Pro magazine. We'll give you 3 issues for £1 plus a free gift - click here
User comments


Why use something that relies on advertisers to implement a server-side feature that they have no incentive to implement?

There are already tools that do this and have been available for over 6 months AND work in the release version of Chrome/Chrome OS. Just search for the headline.

By c6ten on 13 Jan 2012

You can opt out of a number of behavioural advertising sites by visiting the following -

Also, the Google Analytics Opt-out Browser Add-on is available here -

And finally the Google Advertising Cookie Opt-out Plugin -

By Deano on 13 Jan 2012

How about we all stop using their damn browser until they agree to 'do no harm'?

Opps I forget... it's cool to use Android :/

By rhythm on 14 Jan 2012

Leave a comment

You need to Login or Register to comment.



Most Commented News Stories
Latest Blog Posts Subscribe to our RSS Feeds
Latest ReviewsSubscribe to our RSS Feeds
Latest Real World Computing


Sponsored Links

Your email:

Your password:

remember me


Hitwise Top 10 Website 2010

PCPro-Computing in the Real World Printed from

Register to receive our regular email newsletter at

The newsletter contains links to our latest PC news, product reviews, features and how-to guides, plus special offers and competitions.