Resource blocked due to MIME type mismatch (X-Content-Type-Options: nosniff)
<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>