Hi Mike,

Apologies for that. The Standard that is more in line with what we are 
shipping is https://github.com/privacycg/storage-partitioning as we are 
partitioning Blob URLs by the top-level domain.

Sincerely,
Abhishek 

On Friday, August 25, 2023 at 4:07:30 PM UTC-4 [email protected] wrote:

> Hi Abhishek,
> On 8/25/23 11:28 AM, Abhishek Madan wrote:
>
> Summary 
>
> Total Cookie Protection has been enabled by default in Firefox 103. Users 
> now have storage partitioning which protects them from third-party 
> tracking. However, Blob URLs remain unpartitioned and hence still put our 
> users at risk because a Blob can be used as a tracking factor.
>
> To close this loophole, we can partition Blob URLs by using the 
> partitioning key (top-level domain). Entailing, the blob URL will be 
> double-keyed, so blob URLs can only be resolved if the top-level domain is 
> the same as the top-level domain where the blob URL was created. 
> Standard: 
>
> https://github.com/w3c/FileAPI/issues/153
>
> This is just an issue, rather than a standard. Do you intend to update the 
> spec to match what you're shipping? (I didn't see any relevant PRs, but I 
> might have missed one.)
>
> best,
> Mike
>

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