Audio Extender

Volume booster up to 600%, parametric equalizer and audio effects for any tab.

Too quiet video? Voices lost behind the music? Headphones that sound flat? **Audio Extender** makes any website sound better — YouTube, Twitch, podcasts, online courses, browser games and more. **🔊 Up to 600% louder** Raise the volume far beyond 100%. A built-in limiter keeps it clean: louder, but never crackling or distorted. Set your own maximum if you like. **🎚️ Studio-grade equalizer** Drag points on a live frequency curve to boost bass, bring out vocals or tame harsh highs. Prefer sliders? Switch to 10 or 31 bands. Ready-made presets (Bass Boost, Vocal, Podcast, Rock and more) and your own presets fit whichever equalizer is on. **🎧 Headphone correction** Pick your model from the AutoEq database of thousands of headphones and hear them the way they should sound. **⏩ Video speed controller** 0.1× to 16× with the familiar keys: `S` / `D` slower / faster, `R` back to 1×, `G` between 1× and your last speed, `Z` / `X` jump back / forward. A short "1.5×" badge confirms the change — no permanent overlay. Change or turn off any key, also per site; optional hold-for-2×, A-B loop and frame steps. **✨ Fix the sound with one switch** - **Clear dialogue** — understand voices in films and streams even when the music is loud - **Night mode** — quiet scenes louder, explosions quieter - **Bass boost**, **stereo width** and **pitch** — more punch, a wider stage, voices higher or lower at any speed - **Normalization** — every video plays at a similar loudness - **Mono** and **left/right balance** — for one earbud or hearing on one side **🎛️ Every tab under control** The Mixer shows all tabs playing sound: set each tab's volume (even two tabs of the same site), mute it, play one solo, give all tabs the same loudness, or lower other tabs automatically while you watch something. **🔈 Each tab on its own device** Send a video to your headphones while music keeps playing on the speakers. Remembered per site. **💾 Remembers every site** Settings are saved per site. Save a site's sound as a profile and apply it anywhere in one click, use it only on the sites you choose, and sync your settings through your Firefox account if you want. **🎨 Make it yours** 5 themes (Neon, Cyber, Sunset, Aurora, Light), 6 languages, popup or sidebar, keyboard shortcuts: `Alt+Shift+A` open, `Alt+Shift+↑/↓` volume, `Alt+Shift+B` on/off. **📱 Also on Android** Works in Firefox for Android too — the same booster, equalizer, effects and speed, sized for your finger. (Sidebar, keyboard shortcuts, muting tabs and the output device are desktop-only.) **🔒 Private by design** No data collection, no ads, no analytics. All sound processing happens locally in your browser. The only network request: downloading the public AutoEq database when you search for your headphones. **Good to know** Firefox doesn't allow extensions on its own pages (settings, PDF viewer, addons.mozilla.org). DRM-protected audio (for example Spotify or Netflix) can't be changed by any extension — it keeps playing normally, just without effects. Open source (GPL-3.0): [github.com/AlexeyKopkin/Audio-Extender](https://github.com/AlexeyKopkin/Audio-Extender) Enjoying it? [Buy me a coffee](https://buymeacoffee.com/kotx) ☕