Bring user to last page viewed on browser restart.

* Workaround for low memory issue in https://bugzilla.mozilla.org/show_bug.cgi?id=965629

Change-Id: I28086aacdca24054243449e74aa5f2d58e094a9d
Workaround for app crashing on low memory. Retain last page location.

Change-Id: I48121f3ddeb3168370ce91d644fa48439a3d0dee
Merge changes I48121f3d,I28086aac

* changes:
  Workaround for app crashing on low memory. Retain last page location.
  Bring user to last page viewed on browser restart.