How to set auth properly from user object gotten from the popup

[mukuljainx]

Hi, I am following the guide https://dev.to/lvn1/google-authentication-in-a-chrome-extension-with-firebase-2bmo, to get the user tokens for my extension, current issue is I am unable to set auth correctly from the user object, I don't see any such function as response only contains JSON, it is not possible to use the updateCurrentUser user function as well.

If anyone has faced the same issue, kindly guide!