After deploying React App to Firebase, In Network calls we will see 200 status code but in Response Preview, we will see the message as “You need to enable JavaScript to run this app” . I too faced this issue after deploying my React App to firebase.
In my case issue is with the BASE_URL. Go to your firabse settings and check the config details.
Cross-check with your network call base url with the config details like databaseURL, authDomain. If your network call BASE_URL is not matching with the config details, update your BASE_URL and then deploy the app again. I have fixed my issue by following these steps. If it is not fixing in your case, please follow the proper deployment guidelines.
You can deploy your React App to Firebase by using these instructions : https://learnersstore.com/2024/12/29/deploying-reactjs-app-to-firebase
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