Provide references for CVE-2021-29993.
Where can I find more information about CVE-2021-29993?
References are available at: https://www.mozilla.org/security/advisories/mfsa2021-38/, https://bugzilla.mozilla.org/buglist.cgi?bug_id=1712242%2C1708767%2C1712240%2C1708544%2C1729259.