Searching for firefox in google play, I'll find the regular firefox browser (v46), along with firefox focus, firefox beta and firefox nightly, but v.47 doesn't show. The device is a Motorola Nexus 6 running android 7.1.1. What I don't understand is the fact that I had installed firefox v47 for two weeks, then I performed a factory reset (due to other unrelated reasons) and after that, It seems firefox v47 has become elusive for my device, despite it is the same device and the same android version.

Thanks.