The Amazon Fire tablets are basically their own customized Android tablets. You may be able to side load the Firefox .apk files to it. However not sure if you will get updates this way. https://www.mozilla.org/firefox/android/all/ ex: https://www.amazon.com/gp/help/customer/display.html?nodeId=201482620 Mozilla wanted to put the Android Firefox on the Amazon appstore as Mozilla did have Android Firefox 9.0 up there briefly (in end of Dec 2011?). However it was found that Amazon modified and resigned the apk which caused update problems so Mozilla pulled it shortly after. Mozilla has contacted Amazon many times about modifying this policy, so far Amazon has been unwilling with no progress on this since.