HI oter166, Thank you for your question, I understand that you would like to put the previous version of Firefox for Android back on your tablet. (Please not that there might be a data loss when doing this) There are Nightly builds, however Google Play is the only place for the official release. [https://ftp.mozilla.org/pub/mozilla.org/mobile/releases/]-> go to version, then platform, then language, apk files you may have to enable downloads from other sources besides Google play.