I never saw a response to my inquiry below.  The crux of it is this: I'm a 
third-party site that receives DNT:0, so the user has explicitly chosen to 
allow me to track them, but Firefox is blocking my cookies with this feature.  

What does Mozilla recommend I do to set state on the browser?  I can only 
assume, based on how this feature is designed, that Mozilla's position is that 
the user must set DNT:0 AND enable cookies from third-parties.  Is that 
correct?  Or will you be providing a playbook of workarounds for sites to use 
when DNT:0 is received?

I did notice on the privacy roadmap[1] that this feature is listed as a P3 
under "Not Yet Awesome Enough".  Are there plans to also implement the P2 just 
above it, "Create API so sites can request third-party cookies"?  Seems like 
that one is also needed to move this closer to the stated goal of making 
"tracking relationships more obvious to the user."

As it stands now, Firefox disregards the user's DNT choice to be tracked and 
silently breaks some sites.  Can you provide an explanation of how this feature 
is making tracking relationships more obvious to the user?  Because all I see 
is a feature that by default silently blocks third-party cookies with the user 
completely unaware of what is transpiring. 

Obviously you can ship what you want, but if the expectation is that the user 
must change two different settings to enable tracking, then that isn't a 
meaningful choice for the user.  You might as well be honest and declare 
Firefox to be a privacy-only browser; you can default to DNT:1, enable 
third-party cookie blocking, build in other technological measures to counter 
"tracking", and be done with it.  You can't claim to support user choice[2] if 
you ship this feature as-is because there isn't any meaningful user choice 
being offered.


- Bil

[1] https://wiki.mozilla.org/Privacy/Roadmap/2012
[2] 
http://blog.mozilla.org/privacy/2012/05/31/do-not-track-its-the-users-voice-that-matters/


-----Original Message-----
From: Bil Corry
Sent: Monday, February 25, 2013 12:49 PM
To: Asa Dotzler; [email protected]
Subject: RE: partial third-party cookie blocking

On 2/23/2013 11:11 PM, Asa Dotzler wrote:
> On 2/24/2013 10:51 AM, Mxx wrote:
> > It is my understanding that the dire for this feature is to protect
> users from tracking and not to break websites' regular functionality.
> 
> That is not the driver for this feature. We are not trying to stop 
> tracking with this feature. We are trying to make tracking 
> relationships more obvious to the user.

I fired up Nightly and set the DNT preference to 0 (aka "Tell sites I want to 
be tracked").  So even though I said I wanted to be tracked, when I visited a 
site with third-party content, all third-party cookies were blocked.

This brings up some questions:

1. To me, as a user, this is non-intuitive.  Is there a way to harmonize cookie 
behavior with the DNT preference?

2. What does Mozilla recommend as a best practice for third-parties that have 
permission to track, but can't because of this new cookie policy?

3. If third-parties can't ever set state on the browser, then what's the point 
of DNT (since tracking is always blocked)?

4. Mozilla publicly came out against a default choice for tracking[1], yet this 
new cookie policy runs counter to that position by blocking tracking by 
default.  Does Mozilla still believe tracking is an expressed user preference?  
Or only for DNT, but not cookies?  It's somewhat hollow to say DNT should be a 
user-expressed preference, then prevent tracking regardless of that preference.


- Bil


[1] 
http://blog.mozilla.org/privacy/2012/05/31/do-not-track-its-the-users-voice-that-matters/

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