Mozilla: Incorrect JITting of arguments led to use-after-free during garbage collection

The Mozilla Foundation Security Advisory describes this flaw as: The JIT created incorrect code for arguments in certain cases. This led to potential use-after-free crashes during garbage collection...

Mozilla: Type confusion for special arguments in IonMonkey

JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR 78.1, Firefox 79, and Thunderbird 78.1...