I also had the same issue but it was resolved by disabling my cors extension
If you are using CORS extension, disable it and you will be fine! Thanks
Try to to enable the Email/Password provider using an incognito window, or try using a different supported browser.
Verify if there are any other programs that might be blocking your connection such as antivirus, proxy or firewall. If yes, try to disable them.
Connect using a different network or machine
disable CORS extension, for enable authentication and for edit rules firebase database
Simple Disable CORS Extension and it will works.
Disabling the CORS extension will remove the issue
Simply disable your cors extension and error will be resolved
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