Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
https://www.mozilla.org/security/advisories/mfsa2021-54/
https://www.mozilla.org/security/advisories/mfsa2021-53/
https://www.mozilla.org/security/advisories/mfsa2021-52/
https://www.debian.org/security/2022/dsa-5034
https://www.debian.org/security/2021/dsa-5026
https://security.gentoo.org/glsa/202208-14
https://security.gentoo.org/glsa/202202-03
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html