Proxy Auto-Configuration file can define localhost access to be proxied (CVE-2018-18506).
Memory safety bugs fixed in Firefox 66 and Firefox ESR 60.6 (CVE-2019-9788).
Use-after-free when removing in-use DOM elements (CVE-2019-9790).
Type inference is incorrect for constructors entered through on-stack replacement with IonMonkey (CVE-2019-9791).
IonMonkey leaks JSOPTIMIZEDOUT magic value to script (CVE-2019-9792).
Improper bounds checks when Spectre mitigations are disabled (CVE-2019-9793).
Type-confusion in IonMonkey JIT compiler (CVE-2019-9795).
Use-after-free with SMIL animation controller (CVE-2019-9796).