Hi Basha.
Go to <your environment url>/ServiceCenter
Login and find your application under the Factory menu, Application list.

Clicking the name of your application will lead you to its detail page.
Find the Module where you are using the Firebase component and click the name.
In this case, I'm using In-App Chat Web app as an example.
I'm using the In-App Chat Web component in the Sample, so I'll be setting the values there.
Go to the Site Properties tab and select the property you want to set.

Paste your ProjectId in the textarea and click Apply.
Do the same for the Secret and your Firebase component should be working.

Hope this helps.
Cheers