title: JavaScript detect iOS Firefox
body: <p>This is a follow up from <a href="https://stackoverflow.com/questions/36813557/append-within-append-iframe-within-append-in-jquery">Append within Append, Iframe within Append in Jquery</a></p>
  
  <p>I realize the code works against most browsers but doesn't work in Firefox mobile iOS. Can anyone enlighten me how I can detect iOS Firefox so that I can display a error to user?</p>
  
  <p>I read about modernizr about feature detect but it doesn't seems to detect about Firefox not writing to iframe if refreshed. So I wish to just display an error for now. </p>