title: Desktop in Mobile User Agent: Firefox display improperly
body: <p><img src="https://i.stack.imgur.com/n3uOs.jpg" alt="enter image description here"></p>
  
  <p>I use the same user agent string 'Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5'
  for FireFox and Chrome in desktop to see mobile versions of websites. But they displays in a huge different way. </p>
  
  <p>Is FireFox unable to display a mobile version? I tried many sites and I think there should be something wrong with the browser.</p>
  
  <p>How can I fix it? or I have to swith to Chrome to develop now.</p>