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ES6-ify some things. Still a long way to go...
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@@ -71,10 +71,10 @@ var Overlay = Module("Overlay", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReferen
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let doc = target.ownerDocument || target.document || target;
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let listeners = this.getData(doc, "listeners");
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if (!isObject(event))
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var [self, events] = [null, Ary.toObject([[event, callback]])];
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if (isObject(event))
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var [self, events] = [event, event[callback || "events"]];
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else
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[self, events] = [event, event[callback || "events"]];
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[self, events] = [null, { [event]: callback }];
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for (let [event, callback] of iter(events)) {
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let args = [Cu.getWeakReference(target),
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