Updated the preferences xib to put the fallback browser components under the views that don't disappear, which makes the animation look better.
Rearranged the fallback browser collection's item prototype to look better.
Merge branch 'feature/preference-ui-enhancements'

* feature/preference-ui-enhancements:
  Rearranged the fallback browser collection's item prototype to look better.
  Updated the preferences xib to put the fallback browser components under the views that don't disappear, which makes the animation look better.