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Mute media by default

Mutes every video and audio element as soon as it appears, including content loaded later.

Code to copy

// Mute every media element as soon as it appears on the page.
function muteAll() {
  document.querySelectorAll('video, audio').forEach(function (m) {
    try {
      m.muted = true;
      m.defaultMuted = true;
    } catch (e) {}
  });
}
muteAll();
new MutationObserver(muteAll).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.