- switchToParentWindow()
- switchToRecentWindow()
- without history. Only back to previous.
- switchToWindow(predicate: ({ url: Object, title: string }))
switchToWindow(w => w.title === 'test title');
switchToWindow(w => w.location.href === 'http://example.com')
switchToWindow(w => w.title === 'Title' && w.location.host === 'example.com')