Examine source code of Tangible Fullscreen

{
  "manifest_version": 2,
  "name": "Tangible Fullscreen",
  "version": "1.0.0",
  "description": "Esta extensión activa el modo de pantalla completa automáticamente cada 250 milisegundos si no está activado.",
  "permissions": [
    "activeTab",
    "fullscreen"
  ],
  "icons": {
    "64": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "cs.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d464272-067b-4b6b-a0b3-838a434f4ee8}"
    }
  }
}