Is this normal?
Hardly, however no such description applies to mobile devices.
This is a plug in application that user was required to intentionally add to their machine.
With that intent, the visitor deserves what ever door possible slammed in their face.
I had an instance of this on one my sites just two days ago. In my instance, download software's are violation of TOS.
FWIW, these seems to be a new device added to the mobile-mix:
Samsung today (Apr 17, 2013) announced that the Galaxy S 4 will be available from seven different wireless network operators before the end of April. The four national carriers, AT&T, Sprint, T-Mobile USA, and Verizon Wireless, as will smaller carriers U.S. Cellular, Cricket, and C Spire, will each have customized variants of the device specific for their 4G LTE and 3G networks. Samsung said that individual carriers will announce exact availability and pricing during the course of the next few weeks. In addition to carrier availability, the GS4 can also be purchased at various electronics stores
end of quote
I've denied a major provider that seems to be one of the primary providers for this device and as mentioned above in their alliance with major providers.