During the initialization of a new content process, a pointer offset can be manipulated leading to memory corruption and a potentially exploitable crash in the parent process. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
https://seclists.org/bugtraq/2020/Jan/18
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html