Examine source code of iFrame Fullscreen Fit

{
  "manifest_version": 3,
  "name": "iFrame Fullscreen Fit",
  "version": "1.0",
  "description": "Fit iframe videos to the browser size in fullscreen mode.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Enable Fullscreen"
  },
  "icons": {
    "128": "logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc9036fd-434c-4dab-85c2-e68ed0073b62}",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}