Hi @kevin_faurholt - Thank you for the reply! Much appreciated. Given this setup, is there any way to use the message object to: Register custom handlebars helpers? I've tried inline and it looks like it gets stripped. Manipulate the popup dom? For example, in my message object the script retrieves an object from the page's window, manipulates it, then sends it to the popup. Given the size of this object, I'd like to add some fancy twirl downs for easier navigation, but that would require having my own script running in the popup's sandbox or the ability to register custom helpers. Let me know if I'm misunderstanding the mechanics or missed something in the docs. Thanks again! Christian
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