passing arbitrary object when opening window with windowwatcher

Hello

I'd rather to give my window a JS object and not an array/nsIArray and i'm trying to use 
the trick described at https://developer.mozilla.org/en-
US/docs/Working_with_windows_in_chrome_code#Example_5.3A_Using_nsIWindowWatcher_for_passi
ng_an_arbritrary_JavaScript_object but it seems it does not work anymore (I'm using 
Xulrunner 22)
The window.argument is a "[xpconnect wrapped nsISupports]" object, and window.argument[0] 
is too. I tried to unwrap() this object without success. I m not used to handle XPConnect 
or XPCOM so I m a bit lost. So, how could I pass a JS object when opening a window with 
windowwatcher ?

Thanks for your help

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