Since native app installation works only with Nightly (Firefox 13+), we need to add a warning message and hide install/purchases buttons for all other users.
CC'ing fligtar for copy
Link to https://wiki.mozilla.org/Marketplace/Mozillian_Preview
The buttons are still enabled on my Android Stock browser.
user agent is: Mozilla/5.0 (Linux; U; Android 4.0.1; en-us; Galaxy Nexus Build/ITL41F) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
Buttons are still enabled on mobile device . Build identifier : Mozilla/5.0(Android;Mobile; rv:10.0.4)Gecko/10.0.4 Firefox/1-.0.4 Fennec 10.0.4
*** Bug 755397 has been marked as a duplicate of this bug. ***