Karsten,
Thanks so much. Your solution worked beautifully. I stripped it down a
little, since I'm not using an object-oriented context in the overlay.
I'm posting my implementation for reference by others. Thanks again.
var
myAppShell=Components.classes['@mozilla.org/appshell/appShellService;1'].getService(Components.interfaces.nsIAppShellService);
var myHiddenWindow = myAppShell.hiddenDOMWindow;
var obj;
if (!("obj" in myHiddenWindow)) {
myHiddenWindow.obj = new obj();
}
obj = myHiddenWindow.obj;
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