My fire tablet does not support Google play and I don't want to download from Sketchy sites does anybody know what else I should do?

Yup, all the apps are available directly from Mozilla, you might need to keep them updated manually though: support.mozilla.org/questions/1582084 The current version is here: https://archive.mozilla.org/pub/fenix/releases/158.0/android/fenix-158.0-android/