This update for MozillaFirefox fixes the following issues: Firefox Extended Support Release 78.12.0 ESR * Fixed: Various stability, functionality, and security fixes MFSA 2021-29 * CVE-2021-29970: Use-after-free in accessibility features of a document * CVE-2021-30547: Out of bounds write in ANGLE * CVE-2021-29976: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12