500% Volume Booster by Minebom55
Boost webpage audio and video volume beyond 100% using the Web Audio API.
Extension Metadata
About this extension
🔊 Volume Booster — Firefox Extension
Firefox caps webpage volume at 100% natively. Volume Booster breaks that ceiling by routing all audio and video elements through a
✨ Features
Push your browser audio beyond the default 100% limit — up to 500% — using the Web Audio API.
Firefox caps webpage volume at 100% natively. Volume Booster breaks that ceiling by routing all audio and video elements through a
GainNode, letting you crank quiet tabs, videos, or music players to levels that are actually audible. It works on YouTube, Spotify Web, SoundCloud, and any other site that uses HTML5 <audio> or <video> elements.✨ Features
- 🎚️ Volume slider from 100% to 500% — smooth gain control beyond the browser default
- 🔁 Live updates — changes apply instantly without reloading the page
- 👁️ Works on dynamic pages — a
MutationObservercatches media loaded after the page opens (e.g. YouTube)
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Permissions and data
Required permissions:
- Access browser tabs
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.1.1
- Size
- 16.88 KB
- Last updated
- 3 days ago (Apr 2, 2026)
- Related Categories
- License
- MIT License
- Version History
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