Media volume booster
Raises video and audio loudness above 100% via a Web Audio gain node; reload the page to reset.
Code to copy
// Boost video/audio loudness above 100% using a Web Audio gain node.
// Note: volume can only be amplified once per element; reload to reset.
var ctx = new (window.AudioContext || window.webkitAudioContext)();
var gain = ctx.createGain();
gain.gain.value = 2.5; // 250% — lower this if audio distorts.
gain.connect(ctx.destination);
document.querySelectorAll('video, audio').forEach(function (m) {
if (m.dataset.jzBoosted) return;
try {
ctx.createMediaElementSource(m).connect(gain);
m.dataset.jzBoosted = '1';
} catch (e) { /* element may already be routed */ }
});
document.addEventListener('play', function () {
if (ctx.state === 'suspended') ctx.resume();
}, true);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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