My LG G6 phone is at Android 8 and allows me to install the App from Parrots web page or Google Play Store with out problems. I did install the App as a stand a lone APK file which wanted me to upgrade the firmware. So I did and by doing that I had lost my in App purchases. Using the buying option again let me use the fake visa card which never cast anything. So my LG G6 phone is all up to date.
Now we move on to my older LG G4 phone that only has Android 6.0 and cannot be upgraded any further. Trying to install the same APK I get the parse error which we know is caused by the older Android version on the phone. So since the App was back on the Google Play Store I installed FF6 through the store. FF6 now says v6.5.3
Great right , not so fast as the in app purchase problem is not so easy to solve from what I can tell. It will not restore the Apps and when I try to re-buy them my own charge card comes up on google play store. Not wanting to get charged again I have not tried to see if I would indeed get charged.

I suspect Parrot is getting hammered with some very angry customers on their support phone lines.