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Why does Mozilla #Firefox default to allowing websites to use persistent storage, and thus consume gigabytes of disk space when few websites actually have legitimate reasons to use the StorageManager? Isn't that both an invitation to fill my disk and a #tracking / #privacy pitfall?

Seems like there's no UI to facilitate selectively cleaning this stuff, i.e. nuking the local storage for all websites "except these few websites" (and without touching cookies), nor do I see a way to require opt-in.