Examine source code of Hearts Score Scraper

{
  "manifest_version": 2,
  "name": "Hearts Score Scraper",
  "version": "1.0",
  "description": "Scrapes scores from hearts.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.playok.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "papaparse.min.js",
        "index.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/playok-48.png"
    }
  },
  "permissions": [
    "clipboardWrite"
  ]
}