This update for MozillaFirefox fixes the following issues: - Firefox Extended Support Release 78.7.0 ESR * CVE-2021-23953: Fixed a Cross-origin information leakage via redirected PDF requests * CVE-2021-23954: Fixed a type confusion when using logical assignment operators in JavaScript switch statements * CVE-2020-26976: Fixed an issue where HTTPS pages could have been intercepted by a registered service worker when they should not have been * CVE-2021-23960: Fixed a use-after-poison for incorrectly redeclared JavaScript variables during GC * CVE-2021-23964: Fixed Memory safety bugs