Update to 60.6.1

Changelog:
60.6.1
#CVE-2019-9810: IonMonkey MArraySlice has incorrect alias information
#CVE-2019-9813: Ionmonkey type confusion with __proto__ mutations

60.6.0
#CVE-2019-9790: Use-after-free when removing in-use DOM elements
#CVE-2019-9791: Type inference is incorrect for constructors entered through on-stack replacement with IonMonkey
#CVE-2019-9792: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script
#CVE-2019-9793: Improper bounds checks when Spectre mitigations are disabled
#CVE-2019-9794: Command line arguments not discarded during execution
#CVE-2019-9795: Type-confusion in IonMonkey JIT compiler
#CVE-2019-9801: Windows programs that are not 'URL Handlers' are exposed to web content
#CVE-2018-18506: Proxy Auto-Configuration file can define localhost access to be proxied
#CVE-2019-9788: Memory safety bugs fixed in Firefox 66 and Firefox ESR 60.6

Enterprise
    In the network connections settings, sites added to the "No proxy for" list will now honor that setting regardless of any other specified proxy settings

(ryoon)