Log Message:
firefox78: Update to 78.3.0

Security Vulnerabilities fixed in Firefox ESR 78.3

    #CVE-2020-15677: Download origin spoofing via redirect

    #CVE-2020-15676: XSS when pasting attacker-controlled data into a
    contenteditable element

    #CVE-2020-15678: When recursing through layers while scrolling, an iterator
    may have become invalid, resulting in a potential use-after-free scenario

    #CVE-2020-15673: Memory safety bugs fixed in Firefox 81 and Firefox ESR 78.3