Google sign in with redirect page does not sign in, nor create a user

### Step 1: Describe your environment

* Operating system: IPadOS
* Browser: Safari
* Firebase SDK version: latest

### Step 2: Describe the problem:

#### Steps to reproduce:

1. Clone the repository
2. Create a new firebase project
3. Add a web app to the firebase project
4. Enable google authorization for the project
5. Navigate to auth directory
6. Login to firebase
7. Add the project to firebase
8. Populate config.js with the firebase project config values
9. Install npm dependencies
10. Deploy the firebase app
11. Test the app by navigating to the google sign in with redirect page
12. Click sign in with google button
13. Accept the terms and click continue on the redirect page
14. After redirect, user values displayed on the page remain null, firebase project does not show any new users

#### Observed Results:

* No user was created, and no sign in was performed

#### Expected Results:

* The page to display the user credentials after redirect, and a new user record to display in the firebase console