Examine source code of Voice Command Overlay

{
  "manifest_version": 2,
  "name": "Voice Command Overlay",
  "version": "1.0",
  "description": "Control your browser using simple voice commands like 'scroll down', 'mute tab', etc.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f4fcc8f-b028-443b-8c15-1d6625409dfa}"
    }
  }
}