Currently being used to emulate Mute Tab Shortcuts for Chrome, because Firefox didn't have a similar extension.
Hotkeys:
Keys Function
Alt+1 Toggle audio of current active window
Alt+2 Mute all audible windows except current active window
Alt+3 Toggle audio of all audible windows
Changing Hotkeys:
- Click Extensions icon in top right of Firefox window
- Click Manage Extensions at the bottom
- Click gear icon towards the top of the page
- Click Manage Extension Shortcuts at the bottom
- Rebind to whatever you want
