Mozilla did have Firefox for Android on the Amazon app store for a brief time as of version 9.0 (released way back in December 2011) however Amazon complicated things by modifying the file and causes problems with updates so Mozilla pulled it and Amazon have not be cooperative with this since. You may be able to still side load the apk file. Not sure which one is likely to work best of the recent tablets. https://archive.mozilla.org/pub/fenix/releases/134.0/android/ Fenix is the code name for Firefox for Android as to why the folder in above link says fenix.