Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 91.7.0 ESR. Security Fix: * Mozilla: Use-after-free in XSLT parameter processing * Mozilla: Use-after-free in WebGPU IPC Framework * expat: Malformed 2- and 3-byte UTF-8 sequences can lead to arbitrary code execution * expat: Namespace-separator characters in xmlns[:prefix] attribute values can lead to arbitrary code execution * expat: Integer overflow in storeRawNames * Mozilla: Use-after-free in text reflows * Mozilla: Browser window spoof using fullscreen mode * Mozilla: iframe allow-scripts sandbox bypass * Mozilla: Time-of-check time-of-use bug when verifying add-on signatures * Mozilla: Temporary files downloaded to /tmp and accessible by other local users 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.