While I creating project in the Firebase console, I getting the error "You have exceeded the maximum number of free Google projects that you can create. Try deleting unused projects in the Google APIs console or request a project limit increase".
I removed unused projects from Firebase console, now i have only 2 projects in Firebase console, still it showing the error.
Is there any limit for project creation in Firebase?
Firebase Projects are tied to a Google Cloud Service Project. Deleting the firebase project won't automatically delete the Google Cloud Service Project. If you want to delete the other unused Google Cloud Service projects then navigate to https://console.cloud.google.com. There it will allow you to delete the Google Cloud Service Projects. Hope this helps!
There is a limitation due to the number of Google cloud platform projects of your account.
Normally, you can create about 10 projects, if you want to create more, a pop-up comes and you can apply for more projects through the pop-up link.
来源：https://stackoverflow.com/questions/38120044/cannot-create-new-project-in-firebase-console