This Firebase node is abandoned now for more then 5 years, not sure if it will ever work.
According the help Note: You'll need to register your own Firebase account, and edit all of the Firebase nodes to use your personal Firebase URL.
So this looks to me that the Firebase url includes something like an apikey or other credentials, did you tried that?
Hi,
Could you tell me more about what you did to get this error. I suspect an installation error, probably due to previous Firebase nodes installation. The mentioned error does not come from the API. Could you try manually deleting the previous node folders.
Note that you need at least version 14 of Node.js.
Please come back to this forum if you have any further questions