Video frames could have been leaked between origins in some situations. This vulnerability affects Firefox < 132, Firefox ESR < 128.4, Firefox ESR < 115.17, Thunderbird < 128.4, and Thunderbird < 132.
https://www.mozilla.org/security/advisories/mfsa2024-59/
https://www.mozilla.org/security/advisories/mfsa2024-58/
https://www.mozilla.org/security/advisories/mfsa2024-57/
https://www.mozilla.org/security/advisories/mfsa2024-56/
https://www.mozilla.org/security/advisories/mfsa2024-55/
https://lists.debian.org/debian-lts-announce/2024/11/msg00001.html
https://lists.debian.org/debian-lts-announce/2024/10/msg00034.html