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So now when I build a website and want to use a cookieless domain for assets, my site is going to be broken for Firefox users until I get it blessed by Mozilla?

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> my site is going to be broken for Firefox users until I get it blessed by Mozilla?

This feature is only enabled in Private Browsing mode; most users will be unaffected.

no. how do you come to that conclusion?

I read the article? The new feature uses a whitelist provided by Mozilla to determine if a given site is allowed to load an asset from a given external hostname. Their example makes it seem like twitter gets to be blessed with being able to continue loading images, but there's no mention of what smaller publishers need to do to get added to the blessed list

> The new feature uses a whitelist provided by Mozilla to determine if a given site is allowed to load an asset from a given external hostname.

It's not a whitelist, but a blacklist of known tracking sites. Your cookieless domain for assets is not in there.

Ahhh I see, so it's like a blacklist paired with a whitelist. I missed that sites not found on the first list would be unrestricted. Thanks for the explanation

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