Firefox infinite scroll bug

Scrolling right keeps expanding the inner area because of the "theproblem" element being positioned absolutely outside the div.

by connor_holloway_xerini

HTML

<div id="box">
  <div id="header">
    Lorem ipsum d
    <div id="theproblem">
    
    </div>
  </div>
  <!-- below is optional -->
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam facilisis porttitor 
  </div>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam facilisis porttitor 
  </div>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam facilisis porttitor 
  </div>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam facilisis porttitor 
  </div>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam facilisis porttitor 
  </div>
</div>

CSS

body {
  background: white;
}

#box {
  width: 400px !important;
  height: 100px;
  overflow: auto;
  border: 1px solid black;
}

#header {
  position: sticky;
  top: 0px;
  left: 0px;
  border: 1px solid green;
  display: inline-block;
}

#theproblem {
  position: absolute;
  right: -10px;
}

div {
  width: 500px;
  border: 1px solid blue;
}