Also, Firefox for Android has Google AdMob integration and uses firebase as a hosting service for some scripts. I lately started to use Appwarden [1] to check

Also, Firefox for Android has Google AdMob integration and uses firebase as a hosting service for some scripts. I lately started to use Appwarden [1] to check some apps, and I'm amazed how messed up the App ecosystem is in terms of advertising trackers and abusive CDNs - even if you use only AOSP builds, no gapps, and only f-droid, you can get compromised very easily. [1] https://gitlab.com/AuroraOSS/AppWarden https://gitlab.com/AuroraOSS/AppWarden