Booster

Simple Audio Boost Extension

Booster lets you crank the volume past 100% on any website (YouTube, Netflix, Twitch, Spotify, random web videos — everything) using a proper AudioWorklet. No ads, no tracking, super lightweight.

Features

• Real-time boost with zero quality loss
• Works on every audio/video element (even ones added dynamically)
• Per-tab settings — your boost level stays for that tab only
• Clean popup slider + number input
• Works in all frames (iframe videos included)
• Firefox + Chromium support with one codebase

How to Install

Chrome / Edge / Brave

1. Download booster-chromium.zip from the Releases tab
2. Unzip it anywhere
3. Go to chrome://extensions/
4. Turn on Developer mode
5. Click Load unpacked -> select the folder

Firefox

1. Download booster-firefox.xpi
2. Drag & drop the .xpi file into Firefox (or go to about:debugging#/runtime/this-firefox -> "Load Temporary Add-on" for testing)

How to Use

1. Click the Booster icon in your toolbar
2. Move the slider
3. Done — every sound on the tab is instantly louder