CVE-2019-17011
Under certain conditions, when retrieving a document from a DocShell in the antitracking code, a race condition could cause a use-after-free condition and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71. Date published : 2020-01-08 https://www.mozilla.org/security/advisories/mfsa2019-36/