Firefox does not use native Promise

[mnpenner]

This probably isn't a bug, but I found it quite surprising that Firefox v50 isn't using the native Promise implementation!

I'm just wondering why not? Are there bugs in native implementation?

I ran into an issue because fetch() is returning a native Promise but core-js is feeding me a patched Promise for everything else, which broke all my extensions. I realize this is not core-js's fault and I found a workaround, but I just wanted to confirm this was intentional.

[zloirock]

FF does not support custom unhandled rejection handlers, #140

[mnpenner]

@zloirock Got it. Thanks for the response!