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TikTok: pause when the tab loses focus

Pauses the video when you switch to another tab and resumes it when you return to TikTok.

Code to copy

// Pause the video when you switch away from the tab, resume on return
let wasPlaying = false;
document.addEventListener('visibilitychange', function () {
  const v = document.querySelector('video');
  if (!v) { return; }
  if (document.hidden) {
    wasPlaying = !v.paused;
    v.pause();
  } else if (wasPlaying) {
    v.play().catch(function () {});
  }
});

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.