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Vimeo: mute autoplaying videos

Automatically mutes any video that starts playing on its own so sound never surprises you.

Code to copy

// Keep any autoplaying video muted across the site
function muteAll() {
  document.querySelectorAll('video').forEach(function (v) {
    if (!v.paused && !v.muted) { v.muted = true; }
  });
}
muteAll();
document.addEventListener('play', muteAll, true);
const obs = new MutationObserver(muteAll);
obs.observe(document.documentElement, { childList: true, subtree: true });

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's JavaScript panel and save — it runs on every page visit.