This update for MozillaFirefox fixes the following issues: Firefox Extended Support Release 91.9.0 ESR : - CVE-2022-29914: Fullscreen notification bypass using popups - CVE-2022-29909: Bypassing permission prompt in nested browsing contexts - CVE-2022-29916: Leaking browser history with CSS variables - CVE-2022-29911: iframe Sandbox bypass - CVE-2022-29912: Reader mode bypassed SameSite cookies - CVE-2022-29917: Memory safety bugs fixed in Firefox 100 and Firefox ESR 91.9