Examine source code of Auto Mute

{
  "version": "1.0.0",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "manifest_version": 2,
  "author": "KotaHv",
  "browser_specific_settings": {
    "gecko": {
      "id": "{bcaf53db-09e4-4dd3-971b-6ed0ca7e06bc}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "__MSG_browserActionTitle__"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus",
    "<all_urls>"
  ],
  "commands": {
    "toggle-auto-mute": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      },
      "description": "__MSG_toggleAutoMuteCommand__"
    }
  }
}