Log Message:
firefox68: Update to 68.4.0

Security Vulnerabilities fixed in Firefox ESR 68.4:

# CVE-2019-17015: Memory corruption in parent process during new content process \ 
initialization on Windows
# CVE-2019-17016: Bypass of @namespace CSS sanitization during pasting
# CVE-2019-17017: Type Confusion in XPCVariant.cpp
# CVE-2019-17021: Heap address disclosure in parent process during content \ 
process initialization on Windows
# CVE-2019-17022: CSS sanitization does not escape HTML tags
# CVE-2019-17024: Memory safety bugs fixed in Firefox 72 and Firefox ESR 68.4