According to F-Droid [1], it contains `com.google.android.gms:play-services-analytics`. [1]: https://gitlab.com/fdroid/rfp/issues/171#note_30410376
I think I'm only surprised to see this comment and not that Firefox bundled analytics into their app. What's controversial about anonymized usage statistics in 2017?
Since you've used the term "anonymised" quite pointedly, I'm guessing the latter. I do find it surprising that anyone would assume data Google is collecting on your usage is somehow anonymous.