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Fix non-window observers.
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@@ -308,7 +308,7 @@ var Storage = Module("Storage", {
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addObserver: function addObserver(key, callback, window) {
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var { observers } = this;
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if (window)
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if (window instanceof Ci.nsIDOMWindow)
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observers = overlay.getData(window, "storage-observers", Object);
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if (!hasOwnProperty(observers, key))
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