[Firefox] Iterating over Map, Set in content script with `for of` loop throws with `TypeError: n[Symbol.iterator]().next is not a function`

[zendive]

jsdiff.diff({}, {
    'set': new Set([0, 1]),
    'map': new Map([['a',1],['b',2]]),
});

[zendive]

Known issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1155700