Nor be stored for later retrieval.
Such a firewall, when disabled, would essentially have to restore the whole page memory to how it was when it was enabled, and block access to localStorage / IndexedDB / Cookies / Cache.
Such a firewall, when disabled, would essentially have to restore the whole page memory to how it was when it was enabled, and block access to localStorage / IndexedDB / Cookies / Cache.
I have a real desire for a document firewall mode where nothing can enter or leave.