Avast inner browser. What is it?

[REDACTED]

I'm not sure where to post this information.
It is just an interesting thing.

avast_interface -> my_account -> my_mobile_device -> some_premium_function_("Send_SMS") -> "Go_Premium"

New window is created. We see shopcart with "Avast Mobile Premium" in it.

delete_item_from_cart_(grey_cross) -> "Go_Back_to_avast.com"

Now we can go anywhere using links. To this forum for example.

[REDACTED]

It does not know how to do a POST request.
I can't post anything on this forum using it.

just for test: https://www.google.com
https://www.whatismybrowser.com
https://whatbrowser.org
https://aboutmybrowser.com

OK, it is Chrome 37

And, it does not want to go to the "http", but go to "https" normally.