title: Can I find out if there are other browser windows running webgl?
body: <p>I am creating a three.js powered website, and on some browsers (I am looking at you firefox), if other tabs are also running webGL, my performance stutters.</p>
  
  <p>I would like to know if there is a way to find out (in the browser) if other tabs are consuming webgl services so that I can alert the user.</p>
  
  <p>I appreciate any and all comments!</p>