Add kill switch in the console
There really should be a big red switch in the Firebase console to temporarily disable the application.
If I'm under DOS attack or critical security/privacy issue got exposed I need a very quick way to shutdown the service temporarily until the fix is ready.
You will not need it until you need it!
It seems only possible from CLI, and having the right version of CLI handy in the not so active project is close to impossible, so this is really a console requirement.
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Łukasz Mielicki commented
Even the CLI (firebase hosting:disable) is a no-go here as it does not disable functions and it requires re-deployment to restore the functionality. This more often than not requires a fresh build of the application to be performed and may take considerable time. It's way more then could be expected from the app administrator who might not be the developer.