title: In firefox private window facebook profile picture not showing
body: <p>I have a wordpress website and used social login/register. All going good, but if i open any account created with facebook login in firefox private window, it does not display profile picture.
  <a href="http://prntscr.com/izqoxz" rel="nofollow noreferrer">See screenshot.</a></p>
  
  <p>It happens only in private window.</p>
  
  <p>Please help.</p>