Provide references for CVE-2021-29966.
Where can I find more information about CVE-2021-29966?
References are available at: https://www.mozilla.org/security/advisories/mfsa2021-23/, https://bugzilla.mozilla.org/buglist.cgi?bug_id=1660307%2C1686154%2C1702948%2C1708124, https://security.gentoo.org/glsa/202107-09.