mozilla-appmaker/appmaker — pull request #2039 by flukeout (2014-08-25 18:04:54+00:00)
Title: Fixes install button showing when it shouldn't bug.

STS (steps to test)
* Publish an app
* Follow the link to the app's /install page
* On installable platforms ```Install App``` button is visible (ie Firefox)
* On non-installable platforms, it isn't (ie Chrome)