title: navigator.clipboard.readText() is not working in Firefox
body: <p>I have this code for paste:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>navigator.clipboard.readText().then(
    clipText =&gt; document.querySelector("#Note").innerText += clipText);</code></pre>
  </div>
  </div>
  </p>
  <p>But It has this error:</p>
  <blockquote>
  <p>Uncaught TypeError: navigator.clipboard.readText is not a function</p>
  </blockquote>
  <p><em><strong>help me to solve this bug</strong></em></p>