|Steps to Reproduce:||1) Remove the native FB app from the phone, and just to be thorough, clear browser cache|
2) Download any app that uses FB SSO auth; e.g.
3) Launch the app and click on the Facebook signin button
4) Hit "Sign up here", and then hit the back button
5) Repeat 4) and see if the behavior is consistent
|Expected Behavior:||Consistent, ideally going back to the username/password screen in the oauth dialog flow each time|
|Actual Behavior:||Sometimes it goes back to the username/password screen; sometimes it closes the popup entirely.|