Volume Master is a Firefox extension that lets you boost any tab's volume far beyond the browser default, up to 1000%. Each tab gets its own independent volume level, so you can crank up one tab without affecting others.
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Features:
Boost volume up to 1000% per tab
Bass Boost preset for deeper, punchier audio
Voice Boost preset for clearer speech and podcasts
Default (flat) mode for uncolored playback
One-click reset to 100%, or double-click the slider
Dark mode support
Badge on the toolbar icon shows the current volume level at a glance
