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Vimeo: stop thumbnail autoplay previews

Pauses the preview clips that auto-play inside thumbnails to save your attention and bandwidth.

Code to copy

// Pause hover-preview videos inside thumbnails
function pausePreviews() {
  document.querySelectorAll('[class*="Thumbnail"] video').forEach(function (v) {
    if (!v.paused) { v.pause(); }
    v.autoplay = false;
  });
}
pausePreviews();
const obs = new MutationObserver(pausePreviews);
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.