Firefox 66.0.1 is now available, just a few days after the release of Firefox 66.0 earlier this week, to patch CVE-2019-9810 and CVE-2019-9813, two security vulnerabilities reported by Richard Zhu, Amat Cama, and Niklas Baumstark via Trend Micro’s Zero Day Initiative. According to the security advisory published by Mozilla on March 22nd, CVE-2019-9810 describes a buffer overflow issue and missing bounds check flaw in the Firefox 66.0 release due to incorrect alias information in the IonMonkey JIT compiler for the Array.prototype.slice method.