Log Message:
firefox68: Update to 68.10.0

For anyone curious about the delay: apparently, my ccache cache
was corrupted so the build was failing. *sigh* that won't be a problem
soon...

Security Vulnerabilities fixed in Firefox ESR 68.10

    #CVE-2020-12417: Memory corruption due to missing sign-extension for
    ValueTags on ARM64

    #CVE-2020-12418: Information disclosure due to manipulated URL object

    #CVE-2020-12419: Use-after-free in nsGlobalWindowInner

    #CVE-2020-12420: Use-After-Free when trying to connect to a STUN server

    #CVE-2020-12421: Add-On updates did not respect the same certificate trust
    rules as software updates