The Mozilla web site says Firefox is comparable for Nexus 7 but when I try to download I am redirected to the Google Play store where I am informed that my devise is not comparable with Firefox. I also went to the Mozilla app store and the site informed that I needed to down load Firefox Beta which I tried to do. I was again rerouted to Google Play where I was informed my devise was not comp able and was in able to down load. I have my permissions unchecked to allow downloads from other sites. So how do I download Firefox?