Examine source code of Mute current tab

{
  "manifest_version": 3,
  "version": "2.0.3",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "developer": {
    "name": "Andreas Kössler",
    "url": "https://github.com/akoessler/firefox-mute-current-tab"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c875c02-749f-48b9-8c52-58bec0a68472}",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "images/dark/muted-16.png",
    "32": "images/dark/muted-32.png",
    "64": "images/dark/muted-64.png",
    "128": "images/dark/muted-128.png"
  },
  "action": {
    "default_icon": {
      "16": "images/light/unmuted-16.png",
      "32": "images/light/unmuted-32.png",
      "64": "images/light/unmuted-64.png",
      "128": "images/light/unmuted-128.png"
    },
    "default_title": "Mute Tab",
    "default_area": "navbar"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-mute-tab": {
      "description": "__MSG_commandDescription__",
      "suggested_key": {
        "default": "Alt+C"
      }
    }
  }
}