Video poster/background displays a white coloured flicker effect when loading in Firefox sometimes

[LarsEmbloom]

Expected Behavior

No flicker effect is shown while loading a video in Firefox.

Actual Behavior

Flicker effect is shown while loading a video (sometimes). Appears sometimes for a fraction of a second: poster/background disappears and appears again while a white flicker can be noticed.

Steps to Reproduce

Example, matches with "demo" but different video URL. Issue might be related to the set poster (?). Also the flicker effect seem too fast to record with video recording tools.

<div id="made-in-ny"></div>

<script src="https://player.vimeo.com/api/player.js"></script>
<script>
    const options = {
        id: 'https://player.vimeo.com/video/1024004405?h=4905512895',
        width: 640,
        loop: true
    };

    const player = new Vimeo.Player('made-in-ny', options);

    player.setVolume(0);

    player.on('play', function() {
        console.log('played the video!');
    });
</script>