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Speed up video to 2x

Sets playback rate of every video on the page to 2x and keeps it on replay.

Code to copy

// Set every <video> on the page to play at 2x speed.
function applySpeed() {
  document.querySelectorAll('video').forEach(function (v) {
    try { v.playbackRate = 2; } catch (e) {}
  });
}
applySpeed();
// Re-apply for videos that load or restart later.
document.addEventListener('play', applySpeed, 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.