title: FIDO U2F tokens Web Browsers compatibilty
body: <p>I'm trying to integrate <strong>U2F</strong> Authentication in GWT project and I need to know if is this solution compatible with <strong>all</strong> new web browsers (Firefox, Internet Explorer, Safari...)? Normally in Google Chrome I've to install a plugin that's called <strong>"FIDO U2F (Universal 2nd Factor</strong>) extension". 
  Is the same for others browsers? </p>
  
  <p>Is there any way to work <strong>without</strong> a plugin for new web browser?</p>