'Firebase Google authentication JavaScript network error

I have written a chrome extension that uses firebase Google authentication with firebaseui. It's been working great except on one specific clients network. It seems like a firewall issue. You can see the error in the console here. Client has whitelisted the following domains

www.gstatic.com/ 
*.firebaseio.com
www.googleapis.com 
apis.google.com 
cdn.firebase.com 
*.firebaseapp.com

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