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Worth pointing out that Chrome has been partitioning cache by domain since chrome 86 (released Oct 6th 2020).

https://developers.google.com/web/updates/2020/10/http-cache...

Does anyone know if these protections go further or differ significantly?

Also that Safari - so including iPhone - has done it in some form since 2013 https://bugs.webkit.org/show_bug.cgi?id=110269 and all the time since at least 2017 https://twitter.com/cramforce/status/849621456111624192

That was the first thing that came to mind when I read this article. It looks very similar, though Firefox seems to be addressing more than just resource caching, like addressing the HSTS tracking scheme. Also, I would not be surprised if Chrome eventually did partitioning for anything but Google resources; they surely won't do anything that hurts their surveillance schemes?

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