Eleven Audio Amplifier by SlyJacob

Eleven Audio Amplifier transforms your Firefox browsing experience with powerful audio enhancement capabilities. Control volume levels from 0% to 500% with precision sliders for both global and individual tab management.

Key Features:

Volume amplification up to 500% for quiet audio content
Dual-slider interface for global and per-tab volume control
Complete muting functionality at 0% volume
Choice between popup and persistent sidebar interface
10+ retro-inspired themes including Windows 98, XP, Vista, 7, 10, and 11 styles
Full color customization with preset schemes and custom color pickers
Dark and light mode support for all themes
Automatic settings persistence across browser sessions
Zero data collection - all settings stored locally
Perfect for:

Boosting quiet videos, podcasts, and streaming content
Managing different volume levels across multiple tabs
Customizing your browsing interface with nostalgic themes
Users who need reliable audio control without privacy concerns
The extension works seamlessly across all websites and requires no external connections. Your volume preferences and theme choices are saved locally and never transmitted anywhere