When reusing existing popups Firefox would have allowed them to cover the fullscreen notification UI, which could have enabled browser spoofing attacks. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100. A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of when reusing existing popups; Firefox allowed them to cover the fullscreen notification UI, which possibly enabled browser spoofing attacks.
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