title: Firefox can’t establish a connection to the server at wss
body: <p>I'm developing webchat and got an error on Firefox.</p>
  
  <blockquote>
    <p>Firefox can’t establish a connection to the server at
    wss://directline.botframework.com/v3/directline/conversations</p>
  </blockquote>
  
  <p>I tested on Chrome and Edge works fine, only Firefox could not connect. 
  I'm working on proxy network.</p>