Well that give us this lot... https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d1c70c20e7b52f7295411343e4dc5db8ee7c92b9&tochange=2306e153fba9ca55726ffcce889eaca7a479c29f From that, bug 1324406 looks like the winning entry. Looks like that aligns our same origin policy with other browsers and the spec as you're seeing. I'm afraid since this was a deliberate change and that's where we're now stuck.
Bug 1676008 Comment 11 Edit History
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Well that give us this lot... https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d1c70c20e7b52f7295411343e4dc5db8ee7c92b9&tochange=2306e153fba9ca55726ffcce889eaca7a479c29f From that, bug 1324406 looks like the winning entry. Looks like that aligns our same origin policy with other browsers and the spec as you're seeing. I'm afraid since this was a deliberate change, that's where we're now stuck.