Apply referer policy to window.name
We should apply the user's chosen referer policy to window.name. In other words, if a url has a blank referer, we should clear out window.name for that window. With even the default referer policy, this will have the effect of wiping window.name between user-entered URLs.
This mechanism is also handy because it is currently impossible in XPCOM to distinguish user-entered URLs from javascript redirects of document.location.
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