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WhatsApp Web: pause video autoplay

Automatically pauses every video (including GIF-style clips) that tries to autoplay in chats.

Code to copy

// Pause any auto-playing videos in chat (GIF-style and embedded clips)
function pauseAll() {
  document.querySelectorAll('video').forEach(function (v) {
    if (!v.paused) { v.pause(); }
    v.autoplay = false;
    v.removeAttribute('autoplay');
  });
}
pauseAll();
const obs = new MutationObserver(pauseAll);
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.