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@WPalant @Shamar @zeta @andreas Ditto to Wladimir's points. What you're seeing as a vulnerability, we see as an inextricable consequence of the Web working as intended and as designed.

If you'd like an additional opinion, you're welcome to file an issue at bugzilla.mozilla.org

I'm on holiday for the next two weeks, so I'm going to disengage at this point. It good that you're concerned, but your aim is misplaced.