> I don't think the question should be whether or not the Cookie
> Clearinghouse approach (or the trusted CA approach) is perfect,
> but whether it's better than the nothing. I think it might be.

I suppose it depends on which "nothing" you're looking at.  If Mozilla simply 
leaves the cookie policy alone, all sites continue to work and users can still 
choose to block third-party cookies if they accept its given compatibility 
challenges.  As a user, that's the default setting I want - a browser that 
works out of the box.

I know the thought is to block advertisers from tracking users, but there's two 
problems with this approach, 1) there are non-advertising use cases that this 
breaks, and 2) advertisers are already moving to other state mechanisms, which 
leaves only the non-advertising use cases to bear the brunt of this feature.  
Granted, the Cookie Clearinghouse will help to some extent, but it's reactive 
and the earliest we'll see it in Firefox is toward the end of the year.

The largest issue with the proposed cookie blocking scheme is that it silently 
fails, so the user believes the problem is with the website, when in fact the 
problem is with their (soon-to-be-default) settings.  Perhaps the more 
charitable websites will educate the user on how to make the browser work 
again, which will require the user to change the cookie setting back to 
"normal" - what a pain for users and websites, with no net gain.

If Mozilla is really going to push out the cookie blocking feature, it should 
do what NoScript, AdBlockPlus, and similar tools offer - a UI experience that 
alerts when items are blocked and allows the user to enable those blocked 
items.  At least that gives the user a fighting chance to know what is going 
wrong.  Additionally, the stated goal for this feature is to make cookies more 
transparent, what better way than to provide a UI that shows all the blocked 
cookies and allows the user to unblock them.  It can work in conjunction with 
the Cookie Clearinghouse and wouldn't be much different than the IE 
compatibility view feature where there's a whitelist, but it also offers a UI 
for the user to override.

The other related option to consider is an API so that websites can request an 
exception to the third-party cookie blocking.  It's on the 2012 privacy 
roadmap, so presumably someone has given it some thought.

> We shouldn't let fear prevent us from experimentation, even if that
> experiment fails

Can you share the criteria of what constitutes failure for this feature?


- Bil




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