Firebase now supports Google Analytics, but oddly Google Analytics doesn't support Firebase.

Below, you'll learn how to access Firebase Analytics, why we don't support it, and workarounds for you until we release support. You can also read a short version of this article as a Twitter thread.

You can turn on Google Analytics by simply toggling a button when you create a Firebase project.

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You can view your Analytics directly in the Firebase Console:

It's also available on the Google Analytics dashboard:

Firebase apps are represented as an App + Web.
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Unlike regular properties, Firebase apps don't have a View ID. The View ID is an important and requirement property when requesting report data using the Google Analytics API.

You may have noticed that your Firebase app is not listed in the Arc Analytics project creator.
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We use the Google Analytics Management v3 API to fetch the available account summaries. This is the latest API version and it does not return Firebase apps.
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This is the same problem that other people have experienced. In googleanalytics/ga-dev-tools#304 a user in 2017 was unable to use Google's explorer to fetch their account and in 2019 it continues to be a problem. One user suggests that BigQuery is required to fetch the data instead of Google Analytics Reporting API.

Traditionally, Google Analytics apps use a Tracking ID with an account, property, and view ID. However, Firebase apps (App + Web) appear to use a Measurement ID to identify web data streams.

At the top of the help article, there is a warning that App + Web properties (Firebase apps) are not supported by Google Analytics for iOS or Android.

The Firebase API can access the app's measurement ID, but it can only use the ID to add or remove analytics from a Firebase app.

Around the web, developers are trying to use the Google Reporting API to get Firebase analytics data.
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On StackOverflow, a user explains how to export the data to BigQuery as a workaround, another confirms that there is no public API available for App + Web,

There appear to be two common workarounds to visualize your data outside of the Firebase dashboard:

This seems to be the canonical article on how to use BigQuery with Firebase, unfortunately, it only works for upgraded Blaze plans.
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There is also an official Firebase article explaining how to use BigQuery.

The official Firebase support document explains how to connect Google Data Studio. It's odd and surprising that even Google Data Studio has access to the private API, but this could mean that it'll be opened to the public eventually.

There is no mention on their issue tracker, no mention on their changelog, and no mention on the Firebase Analytics support page.

We're keeping an eye on the Firebase API and have spoken with Firebase support to be notified when access is available.

Please reach out to us to get notified when we release Firebase support!