update for Firefox 8
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@ -493,7 +493,9 @@ var TreeStyleTabUtils = {
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while (targets.hasMoreElements())
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{
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let target = targets.getNext()
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.QueryInterface(Ci.nsIDOMWindowInternal);
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.QueryInterface(Ci.nsIDOMWindow);
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if ('nsIDOMWindowInternal' in Ci) // for Firefox 7 or olders
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target = target.QueryInterface(Ci.nsIDOMWindowInternal);
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windows.push(target);
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}
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