Examine source code of HBO MAX Auto Fullscreen

{
  "description": "Automatically enters the fullscreen mode when playing a title",
  "manifest_version": 3,
  "name": "MAX Auto Fullscreen",
  "version": "1.0.2",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://play.max.com/*",
        "https://play.hbomax.com/*"
      ],
      "js": [
        "src/browser-polyfill.js",
        "src/max-auto-fs.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "max-auto-fullscreen-addon@janbambas.cz",
      "strict_min_version": "58.0"
    }
  }
}