title: What does "CC Graph Reduction" in Firefox Performance tool mean?
body: <p>I am profiling a JavaScript application using the Firefox developer tools, specifically the <em>Perfomance</em> tab.</p>
  
  <p>In the result I see the following entry:</p>
  
  <blockquote>
    <p>CC Graph Reduction - ForgetSkippable</p>
  </blockquote>
  
  <p>Unfortunately I cannot find a clear documentation explaining what it is.</p>
  
  <p>I would like to know:</p>
  
  <ul>
  <li>What is it?</li>
  <li>When is this event usually fired?</li>
  </ul>