Using Firefox 32.0. If I click a question marked as answered, then click the back button in the browser it always behaves as you would expect i.e. goes back to the previous page. If I click an unanswered question, scroll down to the end of the discussion, then click the back button, nothing happens. It only goes back on a second click of the back button. If I click the unanswered question but don't scroll down it behaves as expected.