title: Resource blocked due to MIME type mismatch (X-Content-Type-Options: nosniff)
body: <p>I am developing a web page using JavaScript and HTML, everything was working
  good when I have received this list of errors from my HTML page:</p>
  
  <pre class="lang-none prettyprint-override"><code>The resource from “https://raw.githubusercontent.com/dataarts/dat.gui/master/build/dat.gui.min.js”
    was blocked due to MIME type mismatch (X-Content-Type-Options: nosniff).
  The resource from “https://raw.githubusercontent.com/mrdoob/three.js/dev/build/three.js” was
    blocked due to MIME type mismatch (X-Content-Type-Options: nosniff).
  The resource from “https://raw.githubusercontent.com/mrdoob/three.js/master/examples/js/renderers/CanvasRenderer.js”
    was blocked due to MIME type mismatch (X-Content-Type-Options: nosniff).
  The resource from “https://raw.githubusercontent.com/mrdoob/three.js/master/examples/js/renderers/Projector.js”
    was blocked due to MIME type mismatch (X-Content-Type-Options: nosniff).
  The resource from “https://raw.githubusercontent.com/mrdoob/three.js/dev/build/three.js” was
    blocked due to MIME type mismatch (X-Content-Type-Options: nosniff).
  </code></pre>
  
  <p>These errors appeared after an automatic browser update (Mozilla Firefox), may
  be something has been changed in the set up. Do you know any way to solve this
  problem?</p>