Some users seeing error when viewing my Experience

[sloreno]

I created an Experience and shared it with my coworkers before we post it publicly.  Some of them could view it without issue, but a couple got the same error, specifically when using Firefox. 

The error is: 'root' member of IntersectionObserverInit does not implement interface Element.

Has anyone experienced this before? Is there a known fix? 

Thanks!

[TonghuiMing]

@sloreno This could relate to the List widget, assuming you have one in the app. Is there a way to share the app or configuration with us? Unfortunately, I cannot reproduce the issue you mentioned.

[sloreno]

Thanks for your reply.  I do have a list widget in my app.  Here is a link: 

https://experience.arcgis.com/experience/8489c23c97654b8b9e0c0810e9c7ac31/

I can't reproduce the error either, but almost half of my coworkers are getting it. 

[TonghuiMing]

If that's the case, is it possible to provide their problematic browser (FF) versions as well?

[JessicaHendricks444]

I'm having the same issue with an Experience Builder app I built. I can see the app fine, but my coworkers are seeing the same error in the OP. 

https://experience.arcgis.com/experience/e430e4f317314fdeb3db59d07d3adf70/page/Projected-Buffer/

Any suggestions?