title: Firefox Performance Analysis Tool showing two greyed out circles in loading state instead of a pie chart with values
body: <p>On Firefox 66 on Windows 10, I see the performance analysis tool in the <strong>Network</strong> tab of the <strong>Developer Tools</strong>.</p>
  
  <p><a href="https://i.stack.imgur.com/1qdhO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1qdhO.png" alt="enter image description here"></a></p>
  
  <p>I click the <strong>stop watch</strong> icon to start performance analysis for the requests.</p>
  
  <p>But I see the pie charts greyed out and in the <em>loading</em> state always, no matter how long I wait.</p>
  
  <p><a href="https://i.stack.imgur.com/iqrdY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iqrdY.png" alt="enter image description here"></a></p>
  
  <p>Why aren't they showing the performance metrics? Do I have to turn some setting on?</p>