Oh, so it's not possible. That's a pain! The problem with an overlay frame is that it would have to be anchored to the secure frame, which as I understand it would make the overlay frame implicitly secure too, if I have understood correctly.
It'a a shame it can't be done. I've seen examples of wrapping arbitrary insecure snippets using 'secureFrame:WrapScript' which essentially executes addon insecure code in a secure environment, actually SUF does exactly that, but it would take a long time to pick out how it works. I just can't find enough information on it to know if it's something I can use.
Thank you for your reply.
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