title: Jupyter Notebook Won't Open in Newly Installed Firefox Quantum
body: <p>I installed the newest Firefox version (Quantum v. 65) on an Ubuntu machine and Jupyter Notebook will not open in it from either Anaconda or a command prompt.  </p>
  
  <p>I received the following error:</p>
  
  <p>"Access to the file was denied</p>
  
  <p>The file at /run/user/1000/jupyter/nbserver-11292-open.html is not readable.</p>
  
  <pre><code>It may have been removed, moved, or file permissions may be preventing access."
  </code></pre>
  
  <p>Any ideas on how to fix this would be greatly appreciated. </p>