Gain gives you real control over your browser audio. If a video is too quiet, a stream is mixed badly, or Firefox just does not go loud enough, Gain lets you boost any tab from 0% to 600% using the Web Audio API, far beyond the browser’s built-in limit. Key Features:

Volume control from 0–600% on supported tabs
Bass Boost and Voice Boost EQ filters
Dark mode, synced across popup and settings
Audio tabs list to see tabs currently playing sound
Per-site volume memory for faster repeat use
Default volume setting for newly activated tabs
URL-change reset to prevent boosted settings carrying into a new video or stream
Playlist-friendly option to keep settings when the URL changes
Blacklist and whitelist for site control
Click-to-use activation with optional per-site persistent access
Dynamics compressor to reduce distortion at higher gain
Live toolbar badge, color-coded by volume level
Keyboard controls: arrow keys adjust volume, Shift + Arrow Key adjusts in larger steps
Direct number entry for precise volume control

Privacy: Everything runs locally. No accounts, no tracking, no data sent anywhere — ever. To view the source code, visit the dedicated GitHub repository. Open source under the GPL v3 License.

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