Log Message:
firefox91: Update to 91.2.0

Security Vulnerabilities fixed in Firefox ESR 91.2

    #CVE-2021-38496: Use-after-free in MessageTask

    #CVE-2021-38497: Validation message could have been overlaid on another
    origin

    #CVE-2021-38498: Use-after-free of nsLanguageAtomService object

    #CVE-2021-32810: Data race in crossbeam-deque

    #CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15,
    and Firefox ESR 91.2