Examine source code of Auto Game Screenshot

{
  "manifest_version": 2,
  "name": "Auto Game Screenshot",
  "version": "0.2",
  "description": "Auto Game Screenshot automatically saves a screenshot at the end of your game, ensuring you capture every victory and memorable moment without any effort.",
  "browser_action": {
    "default_icon": "icon_on.png",
    "default_title": "AMQ Auto Screenshot"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://animemusicquiz.com/"
      ],
      "run_at": "document_end",
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3585fb1-0b91-4efd-81cc-4795c72d4ad7}"
    }
  }
}