Nightly and beta releases are available as separate apps.

cpeterso · on Nov 14, 2017

Google Play store link for Firefox Beta: https://play.google.com/store/apps/details?id=org.mozilla.fi...

Google Play store link for Firefox Nightly: https://play.google.com/store/apps/details?id=org.mozilla.fe...

krzyk · on Nov 14, 2017

Wow, I didn't know Nightly got into play store, I installed it as an APK from mozilla site (upgrading APKs is painful in comparison to play upgrades).

ethagnawl · on Nov 14, 2017

Thanks!