Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 91.9.1 ESR. Security Fix: * Mozilla: Untrusted input used in JavaScript object indexing, leading to prototype pollution * Mozilla: Prototype pollution in Top-Level Await implementation For more details about the security issue, including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.