First, your Google account should currently include 'User Alice'( userAlice@gmail.com ) in the default browser. When you firebase logout and then firebase will say
$ firebase logout Logged out form ' userBob@gmail.com '
firebase login , Firebase will open a browser and receive a confirmation (enable or disable). When you accept / authorize, you can see the following in your terminal.
$ firebase login Allow Firebase to collect anonymous CLI usage information? Yes Visit this URL on any device to log in: https://accounts.google.com/o/oauth2/auth?client_id=.... Waiting for authentication... Success! Logged in as ' userAlice@gmail.com '
Nyein
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