I have Sign in With Facebook and Sign In with Google on my React Web App.

Now, if the user has signed in before using Facebook and then later on wants to sign in with Google with same email address as that of his Facebook account firebase sends back this error message:

An account already exists with the same email address from another provider

My question now is how do I get the email address from the error object so I can give my users a better error message?

Here is my code:

   const handleFacebookSignIn = () => {
    let provider = new firebase.auth.FacebookAuthProvider();
    firebase
        .auth()
        .signInWithPopup(provider)
        .then((result) => {
            //Handle success
        }).catch((error) => {
            let errorMessage = error.message;
            if (errorMessage.toLowerCase().includes("An account already exists with the same 
             email address".toLowerCase())) {
                errorMessage = "Please sign in with your google account"; //How can I get the email address from the error object?
            }
            toast.error(errorMessage);
        });
}

Thank you.