This update for MozillaFirefox fixes the following issues: Update to Extended Support Release 91.4.0 : - CVE-2021-43536: URL leakage when navigating while executing asynchronous function - CVE-2021-43537: Heap buffer overflow when using structured clone - CVE-2021-43538: Missing fullscreen and pointer lock notification when requesting both - CVE-2021-43539: GC rooting failure when calling wasm instance methods - CVE-2021-43541: External protocol handler parameters were unescaped - CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence of an external protocol handler - CVE-2021-43543: Bypass of CSP sandbox directive when embedding - CVE-2021-43545: Denial of Service when using the Location API in a loop - CVE-2021-43546: Cursor spoofing could overlay user interface when native cursor is zoomed - Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4 - Removed x-scheme-handler/ftp from MozillaFirefox.desktop