That's not good, could you maybe provide more details in the Github repo [0]? The widget is open source, hopefully we can figure out what is blocking it here.

We test the captcha in browsers up to 8 years old and on many devices, do you perhaps have background workers disabled entirely? Here is a link to the widget on its own [1], does that have the same behavior? How about a minimal worker example [2]?

[0]: https://github.com/FriendlyCaptcha/friendly-challenge [1]: https://unpkg.com/friendly-challenge@0.6.1/index.html [2]: https://jsfiddle.net/christopheviau/90syrp0q/