allow developer to opt into strictly enforced region choices (bug 896613)

https://bugzilla.mozilla.org/show_bug.cgi?id=896613

# Free
![](http://f.cl.ly/items/2j0x3v2U2f0l2X3o0T2l/Screen%20Shot%202013-10-29%20at%206.04.42%20PM.png)
![](http://f.cl.ly/items/182h182M0T0U1E3F0D3O/Screen%20Shot%202013-10-29%20at%206.04.48%20PM.png)

# Paid
![](http://f.cl.ly/items/3H0O021S2t2N1B1w441g/Screen%20Shot%202013-10-31%20at%205.44.40%20PM.png)