title: Why does Devise/Omniauth add garbage to the URL?
body: <p>After signing in with facebook, I'm being redirected to <code>/#_=_</code>, which shows the home page.</p>
  
  <p>This sort of garbage also appeared in other URLs, for example when sign up failed and got redirected to <code>/users/sign_in#_=_</code></p>
  
  <p>Why does this happen, and how can I fix it?</p>