Is the output of the node connected to anything? If yes then disconnect it and try again.
Alternatively I notice that the node is saying "illegal combination of queries". If you configure it with a legal combination is it ok?
Finally, the response from the author to this issue is not very encouraging:
"Unfortunately, the version of the Firebase SDK used in this project is deprecated and no longer supported by Google (specifically the Auth restful endpoints I believe).
See the other issues - I don’t have the bandwidth or motivation at this time to do the necessary updates (I haven’t touched Node-Red or Firebase in a couple of years at this point).
Happy to review pull requests but otherwise I’m afraid you’re on your own for this one"
Basically that means the node is unusable in its current state. Even if it appears to be working in some conditions then at some point in the not too distant future it will stop.
