Bug 883609 - Making OS.File.removeDir work without options;r=froydnj
Bug 883609 - Make Session Restore backups useful;r=ttaubert
Bug 883609 - Porting tests to new Session Restore backup mechanism;r=ttaubert

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rename : browser/components/sessionstore/test/browser_833286_atomic_backup.js => browser/components/sessionstore/test/browser_backup_recovery.js