Created attachment 8339615 [details] TouchKeyboard2ndMonitor.png External non-touch monitor is set as main display. Other metro apps work fine. There might be some 8.1 SDK API we should be calling to fix this, although sounds like a bug in windows.
Tried this again and still happens.
Mass close of bugs in obsolete product https://bugzilla.mozilla.org/show_bug.cgi?id=1350354