Try * https://www.mozilla.org/firefox/android/ ** https://www.mozilla.org/firefox/android/all/ Or for pre release versions. (Generally more than one version may be installed if you wish assuming the device has the resources) * https://www.mozilla.org/firefox/channel/android/ The Release, Beta and Nightly are also available on Google play store. You may need to check and change device settings if you wish to install direct from Mozilla rather than from Playstore.