YouTube: cycle playback speed
Each click bumps the video playback speed up one step and wraps back to 1x after 2x.
Code to copy
// Cycle the playback speed of the current video: 1x -> 1.25 -> 1.5 -> 1.75 -> 2 -> 1
const v = document.querySelector('video.html5-main-video');
if (v) {
const steps = [1, 1.25, 1.5, 1.75, 2];
const i = steps.indexOf(v.playbackRate);
v.playbackRate = steps[(i + 1) % steps.length];
alert('Playback speed: ' + v.playbackRate + 'x');
} else {
alert('No video on this page.');
}How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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