Both, but 2 you may get slighty different referrer, e.g, you might get "https://browserleaks.com" instead of "https://browserleaks.com/javascript"
Bug 1601496 Comment 27 Edit History
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Both, but 2 you may get different referrer than before, e.g, you might get "https://browserleaks.com" instead of "https://browserleaks.com/javascript"