In Usernote the url widget only seems to work on Mac Safari.
Could you tell me which version of Prototyper and MacOS you are using?
I have tested and it doesn't matter the version of prototyper or the OS. It's a Firefox and Chrome security issue. If you want to see the content, you have to click on the shield (on the left in Firefox, right in Chrome) and allow the script.
We will try to fix in a future.
Sorry for the inconvenience.
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