Is Cloud Messaging section removed in the Firebase Console? I also tried to check the documentation but it just redirects me to Firebase Console projects.
https://firebase.google.com/docs/cloud-messaging/js/send-with-console
Although I can't figure out how you're supposed to get there from the console, if you go to the link directly it works. The link is different for each of your projects, though:
https://console.firebase.google.com/project/<projecthere>/notification/compose
If you go to the following link and have more than one project, it will prompt you to click a project and then take you to the composer:
https://console.firebase.google.com/project/_/notification/compose
This was really frustrating to me. I am not sure they are aware that a large amount of their documentation says to go to a thing that seems impossible to find.