How do I remove the following HTML5 video element control in Firefox?

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I am having an issue in Firefox specifically where my elements, before being played, have a bright grey play button overlay over the poster attribute image:

ff yt

Versus in Chrome and IE where the player appears as such:

chrome/ie yt

My HTML is basic:

main {
  width: 75%;
  height: 700px;
  padding-right: 1.9%;
  float: left;
  position: relative;
}

video {
  margin-left: 9.2%;
  margin-top: 11%;
  border: 4px solid black;
  object-fit: initial;
}


/*Causes the poster to not leave gaps between itself and the border*/
<video id="video" width="768" height="432" poster="img/main/intro1poster.png" controls>
        <source src="media/videos/intro1.mp4" type="video/mp4">
        <p>Your browser doesn't support HTML5 video or Flash. 
           A low quality version of the video can be found here: <br/>
           <a href="https://www.youtube.com/watch?v=BDw7xpzH-68">Dev Update #1</a></p>
</video>

This question has been asked in 1 other thread two years ago (How to remove the gray overlay on top of the Video in firefox using the new HTML5 <video>?) that I can find, but no solution was ever presented. I am willing to use javascript in the solution, but I do not want to completely redesign the controls.

1 Answers
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