Examine source code of Power Tab

{
  "manifest_version": 3,
  "name": "Power Tab",
  "version": "1.0.0",
  "description": "Remaps the Tab key on useful links",
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*",
        "https://www.google.co.in/search*"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "power-tab@myextension.com"
    }
  }
}