Comment 2 for bug 1358070

Same error here.

Errors reported in:

observe: function (aWindow, aTopic, aData) {
        // This can be dispatched from either the inner or outer window
        if (aWindow.window == this._aWindow && aTopic == "dom-window-destroyed") {
            Services.obs.removeObserver(this, "dom-window-destroyed");
            this._loseInterest(true);

            this._removeAllListeners();
            this._callbackManager.releaseAll();
        }
    },
le shows the error repeating 200 (?!) times:
    _loseInterest: function (abandoned) {
    }

and over 200 more....