Broken scroll in Firefox with flex items

Question

I have a snippet of my problem in this fiddle:

https://jsfiddle.net/fsdjvv40/

body, html {
    height: 100%;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  width: 100%;
  overflow: auto;
}

.main, .main-panel {
    flex: 1;
}

.content-wrapper, .main {
    display: flex;
}

.content-wrapper {
    flex: 1;
    overflow: hidden;
    flex-direction: column;
    height: 100%;
}

.sidebar-menu {
    background: #2f2f2f;
    color: #fff;
    display: flex;
    flex-direction: column;
    width: 200px;
    overflow-y: auto;
}

.infinite-scroll-component {
    flex: 1 1 0px;
    display: flex;
    overflow-y: auto;
    overflow-x: hidden;
    will-change: contents;
    transform: translateZ(0);
    background: yellow;
}

.main-panel {
    margin: 0;
    width: 100%;
    padding: 30px 30px 0;
    display: flex;
    flex-direction: column;
    max-width: 100%;
}

<div class="content-wrapper">
  <div class="main">
    <div class="sidebar-menu"></div>
    <div class="infinite-scroll-component">
      <div class="main-panel">
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
        <h1>PEPE</h1>
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      </div>
    </div>
  </div>
</div>

the basic problem is that in Firefox the scroll of the given snippet it's not working.But in other browsers, it is working (Chrome, safari).

Can anybody explain me why is this behavior happening? will interesting to know the reason :)