This update for MozillaFirefox fixes the following issues: - Firefox Extended Support Release 78.5.0 ESR * CVE-2020-26951: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code * CVE-2020-16012: Variable time processing of cross-origin images during drawImage calls * CVE-2020-26953: Fullscreen could be enabled without displaying the security UI * CVE-2020-26956 ...