title: Firefox for ubuntu renders wrong colors
body: <p>I've got the following problem:</p>
  
  <p>I'm developing an website, so while I was testing around I've noticed that firefox and chromium display an css bar in different colors. When I switched between several machine I could come to the conclusion that firefox for ubuntu is the problem. On all other devices I've tested the website. It's perfectly fine.</p>
  
  <p>The differences between chrome and firefox rendering:</p>
  
  <p>Firefox: </p>
  
  <p><img src="https://i.stack.imgur.com/QeqRD.png" alt="firefox example: "></p>
  
  <p>Chromium:</p>
  
  <p><img src="https://i.stack.imgur.com/eMgLy.png" alt="chrome example: "></p>
  
  <p>NOTE: Firefox for ubuntu is certainly the problem.</p>
  
  <p>Does someone knows why this is and came up with a solution?</p>