update ExtensionSupport
update ExtensionSupport

refereces:
https://bugzilla.mozilla.org/show_bug.cgi?id=1213426
https://dxr.mozilla.org/mozilla-central/source/toolkit/components/extensions/ext-extension.js
https://dxr.mozilla.org/mozilla-central/source/toolkit/components/extensions/ext-backgroundPage.js

abarreir/crx2ff