Example: so on a Motorola Moto X™ (2. Generation) with Chrome 49.0.2623.91 it doesnt work, but the same device with firefox 45.0 can change viewer to VR.
i know the 'requirements' for mobile devices, but what is, if some devices or browser still does not work.
maybe the " vr supporting device test" doesnt work properly or the vr script is not preloaded or something like this !?